Counties
| County |
FIPS code |
County seat |
Established |
Formed from |
Etymology |
Population |
Area |
Map |
|---|---|---|---|---|---|---|---|---|
| Adair County | 001 | Kirksville | 1841 | Macon County | John Adair (1757–1840), pioneer, soldier, and seventh Governor of Kentucky | 700425607000000000025,607 | 7002568000000000000568 sq mi (70031471000000000001,471 km2) |
|
| Andrew County | 003 | Savannah | 1841 | Part of the Platte Purchase | Andrew Jackson Davis (1826–1910), spiritualist and missionary who settled in St. Louis | 700417291000000000017,291 | 7002435000000000000435 sq mi (70031127000000000001,127 km2) |
|
| Atchison County | 005 | Rock Port | 1843 | Holt County, part of the Platte Purchase | U.S. Senator David Rice Atchison (1807–1886), a Democrat from Missouri | 70035685000000000005,685 | 7002545000000000000545 sq mi (70031412000000000001,412 km2) |
|
| Audrain County | 007 | Mexico | 1831 | Callaway, Monroe and Ralls counties | James H. Audrain, a War of 1812 colonel Missouri State Legislator | 700425529000000000025,529 | 7002693000000000000693 sq mi (70031795000000000001,795 km2) |
|
| Barry County | 009 | Cassville | 1835 | Greene County | William Taylor Barry (1784–1835), jurist and United States Postmaster General | 700435597000000000035,597 | 7002779000000000000779 sq mi (70032018000000000002,018 km2) |
|
| Barton County | 011 | Lamar | 1855 | Jasper County | U.S. Senator David Barton (1783–1837), one of the first senators from Missouri | 700412402000000000012,402 | 7002594000000000000594 sq mi (70031538000000000001,538 km2) |
|
| Bates County | 013 | Butler | 1841 | Van Buren (now Cass) County | Frederick Bates (1777–1825), the second governor of Missouri | 700417049000000000017,049 | 7002848000000000000848 sq mi (70032196000000000002,196 km2) |
|
| Benton County | 015 | Warsaw | 1835 | Pettis and Greene counties | Thomas Hart Benton (1782–1858), U.S. Senator from Missouri | 700419056000000000019,056 | 7002706000000000000706 sq mi (70031829000000000001,829 km2) |
|
| Bollinger County | 017 | Marble Hill | 1851 | Cape Girardeau, Madison, Stoddard and Wayne counties | George Frederick Bollinger (1770–1842), early settler of Missouri | 700412363000000000012,363 | 7002621000000000000621 sq mi (70031608000000000001,608 km2) |
|
| Boone County | 019 | Columbia | 1821 | Howard County | Daniel Boone (1734–1820), American pioneer and hunter | 7005162642000000000162,642 | 7002685000000000000685 sq mi (70031774000000000001,774 km2) |
|
| Buchanan County | 021 | Saint Joseph | 1838 | Part of the Platte Purchase | James Buchanan (1791–1868), 15th President of the United States | 700489201000000000089,201 | 7002410000000000000410 sq mi (70031062000000000001,062 km2) |
|
| Butler County | 023 | Poplar Bluff | 1849 | Wayne County | William O. Butler (1791–1880), U.S. Representative from Kentucky and vice-presidential nominee under Lewis Cass | 700442794000000000042,794 | 7002698000000000000698 sq mi (70031808000000000001,808 km2) |
|
| Caldwell County | 025 | Kingston | 1836 | Ray County | Disputed; either John Caldwell, an Indian scout and friend of respected Colonel Alexander William Doniphan; John Caldwell, Lieutenant Governor of Kentucky; or Mathew Caldwell, a signer of the Texas Declaration of Independence | 70039424000000000009,424 | 7002429000000000000429 sq mi (70031111000000000001,111 km2) |
|
| Callaway County | 027 | Fulton | 1821 | Boone, Howard and Montgomery counties | James Callaway (1783–1815), soldier during the War of 1812 and grandson of Daniel Boone | 700444332000000000044,332 | 7002839000000000000839 sq mi (70032173000000000002,173 km2) |
|
| Camden County | 029 | Camdenton | 1841 | Benton, Morgan and Pulaski counties | Charles Pratt, 1st Earl Camden (1714–1794), an English lawyer, judge, Whig politician, and proponent of civil liberties | 700444002000000000044,002 | 7002655000000000000655 sq mi (70031696000000000001,696 km2) |
|
| Cape Girardeau County | 031 | Jackson | 1812 | One of the five original counties | Sieur de Girardot, a French officer and early explorer of the region | 700475674000000000075,674 | 7002579000000000000579 sq mi (70031500000000000001,500 km2) |
|
| Carroll County | 033 | Carrollton | 1833 | Ray County | Charles Carroll (1737–1832), delegate to the Continental Congress and U.S. Senator for Maryland | 70039295000000000009,295 | 7002695000000000000695 sq mi (70031800000000000001,800 km2) |
|
| Carter County | 035 | Van Buren | 1859 | Oregon, Reynolds, Ripley and Shannon counties | Zimri Carter, pioneering settler | 70036265000000000006,265 | 7002508000000000000508 sq mi (70031316000000000001,316 km2) |
|
| Cass County | 037 | Harrisonville | 1833 | Jackson County | Lewis Cass (1782–1866), senator from Michigan | 700499478000000000099,478 | 7002699000000000000699 sq mi (70031810000000000001,810 km2) |
|
| Cedar County | 039 | Stockton | 1845 | Dade and St. Clair counties | Named for the abundance of Eastern Red Cedar trees | 700413982000000000013,982 | 7002476000000000000476 sq mi (70031233000000000001,233 km2) |
|
| Chariton County | 041 | Keytesville | 1821 | Howard County | Chariton River, a tributary of the Missouri River, whose naming origin is disputed | 70037831000000000007,831 | 7002756000000000000756 sq mi (70031958000000000001,958 km2) |
|
| Christian County | 043 | Ozark | 1859 | Greene, Taney and Webster counties | William Christian (1743–1786), colonel in the American Revolution | 700477422000000000077,422 | 7002563000000000000563 sq mi (70031458000000000001,458 km2) |
|
| Clark County | 045 | Kahoka | 1836 | Lewis County | William Clark (1770–1838), American explorer, soldier, Indian agent, and territorial governor | 70037139000000000007,139 | 7002507000000000000507 sq mi (70031313000000000001,313 km2) |
|
| Clay County | 047 | Liberty | 1822 | Ray County | Henry Clay (1777–1852), American Senator and orator from Kentucky | 7005221939000000000221,939 | 7002396000000000000396 sq mi (70031026000000000001,026 km2) |
|
| Clinton County | 049 | Plattsburg | 1833 | Clay County | George Clinton (1739–1812), soldier and Governor of New York, considered one of the Founding Fathers of the United States | 700420743000000000020,743 | 7002419000000000000419 sq mi (70031085000000000001,085 km2) |
|
| Cole County | 051 | Jefferson City | 1820 | Cooper County | Stephen Cole, pioneering settler | 700475990000000000075,990 | 7002392000000000000392 sq mi (70031015000000000001,015 km2) |
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| Cooper County | 053 | Boonville | 1818 | Howard County | Sarshel Benjamin Cooper, pioneering settler | 700417601000000000017,601 | 7002565000000000000565 sq mi (70031463000000000001,463 km2) |
|
| Crawford County | 055 | Steelville | 1829 | Gasconade County | William H. Crawford (1772–1834), U.S. Senator from Georgia, U.S. Secretary of Treasury, and judge | 700424696000000000024,696 | 7002743000000000000743 sq mi (70031924000000000001,924 km2) |
|
| Dade County | 057 | Greenfield | 1841 | Barry and Polk counties | Major Francis L. Dade (1793?–1835), Major in the U.S. 4th Infantry Regiment, United States Army, during the Second Seminole War | 70037883000000000007,883 | 7002490000000000000490 sq mi (70031269000000000001,269 km2) |
|
| Dallas County | 059 | Buffalo | 1841 | Polk County | George M. Dallas (1792–1864), U.S. Vice President under James K. Polk | 700416777000000000016,777 | 7002542000000000000542 sq mi (70031404000000000001,404 km2) |
|
| Daviess County | 061 | Gallatin | 1836 | Ray County | Joseph Hamilton Daviess (1774–1811), commanded the Dragoons of the Indiana Militia at the Battle of Tippecanoe | 70038433000000000008,433 | 7002567000000000000567 sq mi (70031469000000000001,469 km2) |
|
| DeKalb County | 063 | Maysville | 1843 | Clinton County | Johann de Kalb (1721–1780), a German soldier who served as a major general in the Continental Army during the American Revolutionary War | 700412892000000000012,892 | 7002424000000000000424 sq mi (70031098000000000001,098 km2) |
|
| Dent County | 065 | Salem | 1851 | Crawford and Shannon counties | James Dent, pioneering settler | 700415657000000000015,657 | 7002754000000000000754 sq mi (70031953000000000001,953 km2) |
|
| Douglas County | 067 | Ava | 1857 | Ozark County | Stephen A. Douglas (1813–1861), American Senator from Illinois, and the Democratic nominee for President in 1860 | 700413684000000000013,684 | 7002815000000000000815 sq mi (70032111000000000002,111 km2) |
|
| Dunklin County | 069 | Kennett | 1843 | Stoddard County | Daniel Dunklin (1790–1844), fifth governor of Missouri | 700431953000000000031,953 | 7002546000000000000546 sq mi (70031414000000000001,414 km2) |
|
| Franklin County | 071 | Union | 1818 | St. Louis County | Benjamin Franklin (1706–1790), writer, publisher, orator, and one of the Founding Fathers of the United States | 7005101492000000000101,492 | 7002922000000000000922 sq mi (70032388000000000002,388 km2) |
|
| Gasconade County | 073 | Hermann | 1821 | Franklin County | Gasconade River, a tributary of the Missouri River; the river probably derives its name from the French word "gascon" which means braggart, and could be an old satirical name describing those who boast about their adventures upon return to St. Louis | 700415222000000000015,222 | 7002520000000000000520 sq mi (70031347000000000001,347 km2) |
|
| Gentry County | 075 | Albany | 1841 | Clinton County | Richard Gentry (1788–1837), a distinguished American military colonel in the Seminole Wars | 70036738000000000006,738 | 7002492000000000000492 sq mi (70031274000000000001,274 km2) |
|
| Greene County | 077 | Springfield | 1833 | Crawford and Wayne counties | Nathanael Greene (1742–1786), a major general of the Continental Army in the American Revolutionary War | 7005275174000000000275,174 | 7002675000000000000675 sq mi (70031748000000000001,748 km2) |
|
| Grundy County | 079 | Trenton | 1839 | Livingston County | Felix Grundy (1777–1840), U.S. Congressman and U.S. Senator from Tennessee who also served as the 13th Attorney General of the United States | 700410261000000000010,261 | 7002436000000000000436 sq mi (70031129000000000001,129 km2) |
|
| Harrison County | 081 | Bethany | 1843 | Daviess County | Albert G. Harrison (1800–1839), U.S. Representative from Missouri | 70038957000000000008,957 | 7002725000000000000725 sq mi (70031878000000000001,878 km2) |
|
| Henry County | 083 | Clinton | 1834 | Lillard (now Lafayette) County | Patrick Henry (1736–1799), first post-colonial Governor of Virginia and prominent figure in the American Revolution | 700422272000000000022,272 | 7002702000000000000702 sq mi (70031818000000000001,818 km2) |
|
| Hickory County | 085 | Hermitage | 1845 | Benton and Polk counties | Andrew Jackson (1767–1845), seventh U.S. President, who was nicknamed "Old Hickory" during his military service | 70039627000000000009,627 | 7002399000000000000399 sq mi (70031033000000000001,033 km2) |
|
| Holt County | 087 | Oregon | 1841 | Part of the Platte Purchase | David Rice Holt, Missouri State Representative | 70034912000000000004,912 | 7002462000000000000462 sq mi (70031197000000000001,197 km2) |
|
| Howard County | 089 | Fayette | 1816 | St. Charles and St. Louis counties | Benjamin Howard (1760–1814), a Congressman from Kentucky, governor of Missouri Territory and a brigadier general in the War of 1812 | 700410144000000000010,144 | 7002466000000000000466 sq mi (70031207000000000001,207 km2) |
|
| Howell County | 091 | West Plains | 1857 | Oregon County | Disputed - Josiah Howell, pioneering settler | 700440400000000000040,400 | 7002928000000000000928 sq mi (70032404000000000002,404 km2) |
|
| Iron County | 093 | Ironton | 1857 | Madison, Reynolds, St. Francois, Washington and Wayne counties | The abundance of iron ore in the area | 700410630000000000010,630 | 7002551000000000000551 sq mi (70031427000000000001,427 km2) |
|
| Jackson County | 095 | Kansas City, Independence |
1826 | Lillard (now Lafayette) County | Andrew Jackson (1767–1845), U.S. Senator from Tennessee and later President of the United States | 7005674158000000000674,158 | 7002605000000000000605 sq mi (70031567000000000001,567 km2) |
|
| Jasper County | 097 | Carthage | 1841 | Barry County | William Jasper (c. 1750–1779), a noted American soldier in the Revolutionary War | 7005117404000000000117,404 | 7002640000000000000640 sq mi (70031658000000000001,658 km2) |
|
| Jefferson County | 099 | Hillsboro | 1818 | St. Louis and Sainte Genevieve counties | Thomas Jefferson (1743–1826), third President of the United States, principal author of the Declaration of Independence, and one of the most influential Founding Fathers | 7005218733000000000218,733 | 7002657000000000000657 sq mi (70031702000000000001,702 km2) |
|
| Johnson County | 101 | Warrensburg | 1834 | Lillard (now Lafayette) County | Richard M. Johnson (1780–1850), ninth Vice President of the United States, serving in the administration of Martin Van Buren | 700452595000000000052,595 | 7002831000000000000831 sq mi (70032152000000000002,152 km2) |
|
| Knox County | 103 | Edina | 1843 | Scotland County | Henry Knox (1750–1806) an American bookseller from Boston who became the chief artillery officer of the Continental Army and later the nation's first Secretary of War | 70034131000000000004,131 | 7002506000000000000506 sq mi (70031311000000000001,311 km2) |
|
| Laclede County | 105 | Lebanon | 1849 | Camden, Pulaski and Wright counties | Pierre Laclede (1729–1778), founder of St. Louis, Missouri | 700435571000000000035,571 | 7002766000000000000766 sq mi (70031984000000000001,984 km2) |
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| Lafayette County | 107 | Lexington | 1821 | Cooper County | Gilbert du Motier, the Marquis de Lafayette (1757–1834), French military officer and general in the American Revolutionary War | 700433381000000000033,381 | 7002629000000000000629 sq mi (70031629000000000001,629 km2) |
|
| Lawrence County | 109 | Mount Vernon | 1843 | Barry and Dade counties | James Lawrence (1781–1813), an American naval officer best known for his last words "Don't give up the ship!" | 700438634000000000038,634 | 7002613000000000000613 sq mi (70031588000000000001,588 km2) |
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| Lewis County | 111 | Monticello | 1833 | Marion County | Meriwether Lewis (1774–1809), explorer and governor of the Louisiana Territory | 700410211000000000010,211 | 7002505000000000000505 sq mi (70031308000000000001,308 km2) |
|
| Lincoln County | 113 | Troy | 1818 | St. Charles County | Disputed; either Lincoln County, Kentucky (birthplace of Christopher Clark, a Missouri legislator who advocated for the county's creation), or for Benjamin Lincoln (1733–1810), an American revolutionary war general | 700452566000000000052,566 | 7002630000000000000630 sq mi (70031632000000000001,632 km2) |
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| Linn County | 115 | Linneus | 1837 | Chariton County | Lewis F. Linn (1796–1843), a Jacksonian Democratic U.S. Senator for Missouri | 700412761000000000012,761 | 7002620000000000000620 sq mi (70031606000000000001,606 km2) |
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| Livingston County | 117 | Chillicothe | 1837 | Carroll County | Edward Livingston (1764–1836), a prominent American jurist and statesman, influential in the drafting of the Louisiana Civil Code of 1825, a civil code based largely on the Napoleonic Code | 700415195000000000015,195 | 7002535000000000000535 sq mi (70031386000000000001,386 km2) |
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| Macon County | 121 | Macon | 1837 | Chariton and Randolph counties | Nathaniel Macon (1758–1837), member of the United States House of Representatives from 1791 to 1815 who briefly served in the American Revolutionary War | 700415566000000000015,566 | 7002804000000000000804 sq mi (70032082000000000002,082 km2) |
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| Madison County | 123 | Fredericktown | 1818 | Cape Girardeau and Sainte Genevieve counties | James Madison (1751–1836), politician and political philosopher who served as the fourth President of the United States, and one of the Founding Fathers of the United States | 700412226000000000012,226 | 7002497000000000000497 sq mi (70031287000000000001,287 km2) |
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| Maries County | 125 | Vienna | 1855 | Osage and Pulaski counties | Maries River, possibly a corruption of the French word marais meaning "marsh" or "swamp" | 70039176000000000009,176 | 7002528000000000000528 sq mi (70031368000000000001,368 km2) |
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| Marion County | 127 | Palmyra | 1826 | Ralls County | Francis Marion (1732–1795), a military officer who served in the American Revolutionary War | 700428781000000000028,781 | 7002438000000000000438 sq mi (70031134000000000001,134 km2) |
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| McDonald County | 119 | Pineville | 1847 | Newton County | Alexander McDonald, American Revolutionary War sergeant | 700423083000000000023,083 | 7002540000000000000540 sq mi (70031399000000000001,399 km2) |
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| Mercer County | 129 | Princeton | 1845 | Grundy County | John F. Mercer (1759–1821), an American lawyer, planter, and Governor of Maryland | 70033785000000000003,785 | 7002454000000000000454 sq mi (70031176000000000001,176 km2) |
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| Miller County | 131 | Tuscumbia | 1837 | Cole and Pulaski counties | John Miller (1781–1846), an American publisher and politician from St. Louis, Missouri. He was the fourth Governor of Missouri and represented Missouri in the U.S. House | 700424748000000000024,748 | 7002592000000000000592 sq mi (70031533000000000001,533 km2) |
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| Mississippi County | 133 | Charleston | 1842 | Scott County | Mississippi River, the second-longest river in the United States which forms Missouri's eastern border | 700414358000000000014,358 | 7002413000000000000413 sq mi (70031070000000000001,070 km2) |
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| Moniteau County | 135 | California | 1845 | Cole and Morgan counties | Moniteau Creek; "moniteau" is a French spelling of manitou, the Algonquian Great Spirit | 700415607000000000015,607 | 7002417000000000000417 sq mi (70031080000000000001,080 km2) |
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| Monroe County | 137 | Paris | 1831 | Ralls County | James Monroe (1758–1831), fifth President of the United States who crafted the Missouri Compromise | 70038840000000000008,840 | 7002646000000000000646 sq mi (70031673000000000001,673 km2) |
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| Montgomery County | 139 | Montgomery City | 1818 | St. Charles County | Richard Montgomery (1738–1775), an Irish-born soldier who first served in the British Army and later became a brigadier-general in the Continental Army during the Revolutionary War | 700412236000000000012,236 | 7002539000000000000539 sq mi (70031396000000000001,396 km2) |
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| Morgan County | 141 | Versailles | 1833 | Cooper County | Daniel Morgan (c. 1736–1802), American pioneer, soldier, and United States Representative from Virginia | 700420565000000000020,565 | 7002598000000000000598 sq mi (70031549000000000001,549 km2) |
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| New Madrid County | 143 | New Madrid | 1812 | One of the five original counties | Madrid, Spain | 700418956000000000018,956 | 7002678000000000000678 sq mi (70031756000000000001,756 km2) |
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| Newton County | 145 | Neosho | 1838 | Barry County | John Newton (1755–1780), legendary soldier of the American Revolution | 700458114000000000058,114 | 7002626000000000000626 sq mi (70031621000000000001,621 km2) |
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| Nodaway County | 147 | Maryville | 1843 | Andrew County, the Platte Purchase | Nodaway River, a 120-mile (190 km) long river in southwest Iowa and northwest Missouri | 700423370000000000023,370 | 7002877000000000000877 sq mi (70032271000000000002,271 km2) |
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| Oregon County | 149 | Alton | 1841 | Ripley County | Oregon Territory | 700410881000000000010,881 | 7002792000000000000792 sq mi (70032051000000000002,051 km2) |
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| Osage County | 151 | Linn | 1841 | Gasconade County | Osage River, a 360 miles (580 km) long tributary of the Missouri River in central Missouri; the name of the river is probably derived from a French corruption of "Washazhe" – the name of the Osage Native Americans | 700413878000000000013,878 | 7002606000000000000606 sq mi (70031570000000000001,570 km2) |
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| Ozark County | 153 | Gainesville | 1841 | Taney County | Ozark Mountains – Ozark is the anglicized form of the French "aux arcs", an abbreviation of "Aux Arkansas", which means in the county of Arkansas | 70039723000000000009,723 | 7002747000000000000747 sq mi (70031935000000000001,935 km2) |
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| Pemiscot County | 155 | Caruthersville | 1851 | New Madrid County | An American Indian word meaning "liquid mud" | 700418296000000000018,296 | 7002493000000000000493 sq mi (70031277000000000001,277 km2) |
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| Perry County | 157 | Perryville | 1821 | Sainte Geneviere County | Oliver Hazard Perry (1785–1819), naval officer in the War of 1812 against Britain, earned the title "Hero of Lake Erie" for leading American forces in a decisive naval victory at the Battle of Lake Erie | 700418971000000000018,971 | 7002475000000000000475 sq mi (70031230000000000001,230 km2) |
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| Pettis County | 159 | Sedalia | 1833 | Cooper and Saline counties | Spencer Darwin Pettis (1802–1831), U.S. Representative from Missouri | 700442201000000000042,201 | 7002685000000000000685 sq mi (70031774000000000001,774 km2) |
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| Phelps County | 161 | Rolla | 1857 | Crawford County | John S. Phelps (1814–1886), a politician, soldier during the American Civil War, and twenty-third Governor of Missouri | 700445156000000000045,156 | 7002673000000000000673 sq mi (70031743000000000001,743 km2) |
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| Pike County | 163 | Bowling Green | 1818 | St. Charles County | Zebulon Pike (1778–1813), American soldier and explorer for whom Pikes Peak in Colorado is also named | 700418516000000000018,516 | 7002673000000000000673 sq mi (70031743000000000001,743 km2) |
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| Platte County | 165 | Platte City | 1838 | Part of the Platte Purchase | Platte River, a tributary of the Missouri River, which is in turn named for the French word "platte" meaning flat or shallow | 700489322000000000089,322 | 7002420000000000000420 sq mi (70031088000000000001,088 km2) |
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| Polk County | 167 | Bolivar | 1835 | Greene County | James K. Polk (1795–1849), 11th President of the United States | 700431137000000000031,137 | 7002637000000000000637 sq mi (70031650000000000001,650 km2) |
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| Pulaski County | 169 | Waynesville | 1833 | Crawford County | Kazimierz Pulaski (1745–1779), Polish soldier of fortune in the American Revolutionary War, he saved the life of George Washington and became a general in the Continental Army | 700452274000000000052,274 | 7002547000000000000547 sq mi (70031417000000000001,417 km2) |
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| Putnam County | 171 | Unionville | 1843 | Adair and Sullivan counties | Israel Putnam (1718–1790), an American army general who fought with distinction at the Battle of Bunker Hill during the American Revolutionary War | 70034979000000000004,979 | 7002518000000000000518 sq mi (70031342000000000001,342 km2) |
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| Ralls County | 173 | New London | 1821 | Pike County | Daniel Ralls, a Missouri State Representative | 700410167000000000010,167 | 7002471000000000000471 sq mi (70031220000000000001,220 km2) |
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| Randolph County | 175 | Huntsville | 1829 | Chariton and Ralls counties | John Randolph of Roanoke (1773–1833), a leader in Congress from Virginia and spokesman for the "Old Republican" | 700425414000000000025,414 | 7002482000000000000482 sq mi (70031248000000000001,248 km2) |
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| Ray County | 177 | Richmond | 1820 | Howard County | John Ray, Missouri State Representative | 700423494000000000023,494 | 7002570000000000000570 sq mi (70031476000000000001,476 km2) |
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| Reynolds County | 179 | Centerville | 1845 | Shannon County | Thomas Reynolds (1796–1844), governor of Missouri from 1840 to 1844 | 70036696000000000006,696 | 7002811000000000000811 sq mi (70032100000000000002,100 km2) |
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| Ripley County | 181 | Doniphan | 1831 | Wayne County | Eleazer Wheelock Ripley (1782–1839), Brigadier General in the War of 1812 | 700414100000000000014,100 | 7002630000000000000630 sq mi (70031632000000000001,632 km2) |
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| St. Charles County | 183 | Saint Charles | 1812 | One of the five original counties | St. Charles Borromeo (1538–1584), an Italian saint and cardinal of the Roman Catholic Church | 7005360485000000000360,485 | 7002561000000000000561 sq mi (70031453000000000001,453 km2) |
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| St. Clair County | 185 | Osceola | 1841 | Rives (now Henry) County | Arthur St. Clair (1737–1818), an American soldier and Governor of the Northwest Territory | 70039805000000000009,805 | 7002677000000000000677 sq mi (70031753000000000001,753 km2) |
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| St. Francois County | 187 | Farmington | 1821 | Jefferson, Sainte Genevieve and Washington counties | St. Francis of Assisi (c. 1182–1226), a Catholic deacon and the founder of the Order of Friars Minor, more commonly known as the Franciscans | 700465359000000000065,359 | 7002450000000000000450 sq mi (70031165000000000001,165 km2) |
State map highlighting St. Francois County |
| St. Louis County | 189 | Clayton | 1812 | One of the five original counties | King Louis IX (1214–1270), King of France from 1226 until his death | 7005998954000000000998,954 | 7002508000000000000508 sq mi (70031316000000000001,316 km2) |
State map highlighting St. Louis County |
| Saint Louis City | 510 | St. Louis | 1876 | Created in 1876 when city residents voted to secede from St. Louis County | King Louis IX (1214–1270), King of France from 1226 until his death | 7005319294000000000319,294 | 700161900000000000061.9 sq mi (7002160000000000000160 km2) |
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| Ste. Genevieve County | 186 | Sainte Genevieve | 1812 | One of the five original counties | St. Genevieve (c. 420 – c. 510), the patron saint of Paris in Roman Catholic and Eastern Orthodox tradition | 700418145000000000018,145 | 7002502000000000000502 sq mi (70031300000000000001,300 km2) |
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| Saline County | 195 | Marshall | 1820 | Cooper County | Local hot springs | 700423370000000000023,370 | 7002756000000000000756 sq mi (70031958000000000001,958 km2) |
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| Schuyler County | 197 | Lancaster | 1843 | Adair County | Philip Schuyler (1733–1804), a general in the American Revolution and a United States Senator from New York | 70034431000000000004,431 | 7002308000000000000308 sq mi (7002798000000000000798 km2) |
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| Scotland County | 199 | Memphis | 1841 | Clark, Lewis, and Shelby counties | Scotland (country) | 70034843000000000004,843 | 7002438000000000000438 sq mi (70031134000000000001,134 km2) |
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| Scott County | 201 | Benton | 1822 | New Madrid County | John Guier Scott (1819–1892), a U.S. Representative from Missouri | 700439191000000000039,191 | 7002421000000000000421 sq mi (70031090000000000001,090 km2) |
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| Shannon County | 203 | Eminence | 1837 | Ripley County | George Shannon (1785–1836), member of the Lewis and Clark Expedition | 70038441000000000008,441 | 70031004000000000001,004 sq mi (70032600000000000002,600 km2) |
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| Shelby County | 205 | Shelbyville | 1835 | Marion County | Isaac Shelby (1750–1826), the first and fifth Governor of the U.S. state of Kentucky | 70036373000000000006,373 | 7002501000000000000501 sq mi (70031298000000000001,298 km2) |
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| Stoddard County | 207 | Bloomfield | 1835 | New Madrid County | Amos Stoddard (1762–1813), the only commandant of Upper Louisiana for the French Republic and the only commandant for the District of Louisiana for the United States in 1804 during the handover of the Louisiana Purchase | 700429968000000000029,968 | 7002827000000000000827 sq mi (70032142000000000002,142 km2) |
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| Stone County | 209 | Galena | 1851 | Taney County | William Stone, first elected judge of Taney County | 700432202000000000032,202 | 7002463000000000000463 sq mi (70031199000000000001,199 km2) |
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| Sullivan County | 211 | Milan | 1843 | Linn County | John Sullivan (1740–1795), American Revolutionary War general | 70036714000000000006,714 | 7002651000000000000651 sq mi (70031686000000000001,686 km2) |
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| Taney County | 213 | Forsyth | 1837 | Greene County | Roger Brooke Taney (1777–1864), eleventh United States Attorney General and fifth Chief Justice of the United States | 700451675000000000051,675 | 7002632000000000000632 sq mi (70031637000000000001,637 km2) |
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| Texas County | 215 | Houston | 1843 | Shannon and Wright counties | Republic of Texas | 700426008000000000026,008 | 70031179000000000001,179 sq mi (70033054000000000003,054 km2) |
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| Vernon County | 217 | Nevada | 1851 | Bates County | Miles Vernon, Missouri State Senator – the county was originally defined as having the same boundaries as Bates county, but was later declared unconstitutional and changed | 700421159000000000021,159 | 7002834000000000000834 sq mi (70032160000000000002,160 km2) |
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| Warren County | 219 | Warrenton | 1833 | Montgomery County | Joseph Warren (1741–1775), Revolutionary War doctor and general | 700432513000000000032,513 | 7002432000000000000432 sq mi (70031119000000000001,119 km2) |
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| Washington County | 221 | Potosi | 1813 | Sainte Genevieve County | George Washington (1732–1799), commander of the Continental Army in the American Revolutionary War and first President of the United States | 700425195000000000025,195 | 7002760000000000000760 sq mi (70031968000000000001,968 km2) |
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| Wayne County | 223 | Greenville | 1818 | Cape Girardeau and Lawrence counties | Anthony Wayne (1745–1796), United States Army general and statesman | 700413521000000000013,521 | 7002761000000000000761 sq mi (70031971000000000001,971 km2) |
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| Webster County | 225 | Marshfield | 1855 | Greene County | Daniel Webster (1782–1852), U.S. Secretary of State and Senator from Massachusetts | 700436202000000000036,202 | 7002593000000000000593 sq mi (70031536000000000001,536 km2) |
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| Worth County | 227 | Grant City | 1861 | Gentry County | William J. Worth (1794–1849), a United States general during the Mexican-American War | 70032171000000000002,171 | 7002266000000000000266 sq mi (7002689000000000000689 km2) |
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| Wright County | 229 | Hartville | 1841 | Pulaski County | Silas Wright (1795–1847), an American Democratic politician and Governor of New York | 700418815000000000018,815 | 7002682000000000000682 sq mi (70031766000000000001,766 km2) |
Read more about this topic: List Of Counties In Missouri