List of Counties in Illinois - Alphabetical List

Alphabetical List

Note: the links in the FIPS County Code column are to the Census Bureau info page for that county.

County
FIPS code
County seat
Established
Origin
Etymology
Population
Area
Map
Adams County 001 Quincy 1825 Pike County John Quincy Adams (1767–1848), sixth President of the United States 700467103000000000067,103 7002857000000000000857 sq mi
(70032220000000000002,220 km2)
Alexander County 003 Cairo 1819 Union County William M. Alexander, a settler and state representative in the Illinois General Assembly 70038238000000000008,238 7002236000000000000236 sq mi
(7002611000000000000611 km2)
Bond County 005 Greenville 1817 Crawford County, Edwards County, and Madison County Shadrach Bond (1773–1832), First Governor of Illinois 700417768000000000017,768 7002380000000000000380 sq mi
(7002984000000000000984 km2)
Boone County 007 Belvidere 1837 Winnebago County Daniel Boone (1734-1820), trailblazer of the Wilderness Road in Kentucky 700454165000000000054,165 7002281000000000000281 sq mi
(7002728000000000000728 km2)
Brown County 009 Mount Sterling 1839 Schuyler County Jacob Brown (1775–1828), a successful American Revolution army officer responsible for Great Lakes defenses 70036937000000000006,937 7002306000000000000306 sq mi
(7002793000000000000793 km2)
Bureau County 011 Princeton 1837 Putnam County Pierre de Bureo, Frenchman, North American fur trader 700434978000000000034,978 7002869000000000000869 sq mi
(70032251000000000002,251 km2)
Calhoun County 013 Hardin 1825 Pike County John C. Calhoun (1782–1850), South Carolina senator and seventh Vice President of the United States 70035089000000000005,089 7002254000000000000254 sq mi
(7002658000000000000658 km2)
Carroll County 015 Mount Carroll 1839 Jo Daviess Charles Carroll of Carrollton (1737–1832), signed the Declaration of Independence on behalf of Maryland 700415387000000000015,387 7002444000000000000444 sq mi
(70031150000000000001,150 km2)
Cass County 017 Virginia 1837 Morgan County Lewis Cass (1782–1866), second governor of Michigan Territory, fourteenth United States Secretary of War 700413642000000000013,642 7002376000000000000376 sq mi
(7002974000000000000974 km2)
Champaign County 019 Urbana 1833 Vermilion County Champaign County, Ohio, which took its name from the French for "open level country" 7005201081000000000201,081 7002997000000000000997 sq mi
(70032582000000000002,582 km2)
Christian County 021 Taylorville 1839 Sangamon County Christian County, Kentucky, which was itself named after Colonel William Christian 700434800000000000034,800 7002709000000000000709 sq mi
(70031836000000000001,836 km2)
Clark County 023 Marshall 1819 Crawford County George Rogers Clark (1752–1818), highest-ranking officer in the Northwest Territory during the American Revolution 700416335000000000016,335 7002502000000000000502 sq mi
(70031300000000000001,300 km2)
Clay County 025 Louisville 1824 Wayne, Lawrence, Fayette, and Crawford County Henry Clay (1777–1852), Kentucky legislator who negotiated the Missouri Compromise 700413815000000000013,815 7002469000000000000469 sq mi
(70031215000000000001,215 km2)
Clinton County 027 Carlyle 1824 Washington, Bond, and Fayette County DeWitt Clinton (1769–1828), Governor of New York, responsible for the construction of the Erie Canal 700437762000000000037,762 7002474000000000000474 sq mi
(70031228000000000001,228 km2)
Coles County 029 Charleston 1830 Clark and Edgar County Edward Coles (1786–1868), second Governor of Illinois, responsible for the abolition of slavery in Illinois 700453873000000000053,873 7002508000000000000508 sq mi
(70031316000000000001,316 km2)
Cook County 031 Chicago 1831 Putnam County Daniel Pope Cook (1794–1827), politician and first Attorney General of Illinois 70065194675000000005,194,675 7002946000000000000946 sq mi
(70032450000000000002,450 km2)
Crawford County 033 Robinson 1816 Edwards County William H. Crawford (1772–1834), ninth United States Secretary of War, seventh Secretary of the Treasury 700419817000000000019,817 7002444000000000000444 sq mi
(70031150000000000001,150 km2)
Cumberland County 035 Toledo 1843 Coles County Disputed: Cumberland Road, which entered the county; Cumberland, Maryland; or Cumberland River in Kentucky 700411048000000000011,048 7002346000000000000346 sq mi
(7002896000000000000896 km2)
DeKalb County 037 Sycamore 1837 Kane County Johann de Kalb (1721–1780), German soldier in the Continental Army who fought alongside Gilbert du Motier, marquis de Lafayette 7005105160000000000105,160 7002634000000000000634 sq mi
(70031642000000000001,642 km2)
DeWitt County 039 Clinton 1839 Macon and McLean County DeWitt Clinton (1769–1828), Governor of New York, responsible for the construction of the Erie Canal 700416561000000000016,561 7002398000000000000398 sq mi
(70031031000000000001,031 km2)
Douglas County 041 Tuscola 1859 Coles County Stephen A. Douglas (1813–1861), prominent Illinois Democrat who engaged in debates with Abraham Lincoln 700419980000000000019,980 7002417000000000000417 sq mi
(70031080000000000001,080 km2)
DuPage County 043 Wheaton 1839 Cook County DuPage River 7005916924000000000916,924 7002334000000000000334 sq mi
(7002865000000000000865 km2)
Edgar County 045 Paris 1823 Clark County John Edgar (c. 1750–1832), Illinois delegate to the Northwest Territory legislature; at time, wealthiest man in Illinois 700418576000000000018,576 7002624000000000000624 sq mi
(70031616000000000001,616 km2)
Edwards County 047 Albion 1814 Gallatin County and Madison County Ninian Edwards (1775–1833), third Governor of the State of Illinois and only governor of the Illinois Territory 70036721000000000006,721 7002222000000000000222 sq mi
(7002575000000000000575 km2)
Effingham County 049 Effingham 1831 Fayette and Crawford County Lord Edward Effingham, military officer who resigned from the British Army to avoid fighting the American colonies 700434242000000000034,242 7002479000000000000479 sq mi
(70031241000000000001,241 km2)
Fayette County 051 Vandalia 1821 Bond, Wayne, Clark, Jefferson, and Crawford County Marquis de la Fayette (1757–1834), French military officer who was a key factor in the American and French Revolutions. 700422140000000000022,140 7002716000000000000716 sq mi
(70031854000000000001,854 km2)
Ford County 053 Paxton 1859 Vermilion County Thomas Ford (1800–1850), eighth Governor of Illinois; served during the Illinois Mormon War 700414081000000000014,081 7002486000000000000486 sq mi
(70031259000000000001,259 km2)
Franklin County 055 Benton 1818 White County and Gallatin County Benjamin Franklin (1706–1790), prolific writer, inventor, and politician; key factor in the American Revolution 700439561000000000039,561 7002412000000000000412 sq mi
(70031067000000000001,067 km2)
Fulton County 057 Lewistown 1823 Pike County Robert Fulton (1765–1815), inventor of the steamboat 700437069000000000037,069 7002866000000000000866 sq mi
(70032243000000000002,243 km2)
Gallatin County 059 Shawneetown 1812 Randolph County Albert Gallatin (1761–1849), fourth and longest-serving United States Secretary of the Treasury 70035589000000000005,589 7002324000000000000324 sq mi
(7002839000000000000839 km2)
Greene County 061 Carrollton 1821 Madison County Nathanael Greene (1742–1786), major general in the Continental Army 700413886000000000013,886 7002543000000000000543 sq mi
(70031406000000000001,406 km2)
Grundy County 063 Morris 1841 LaSalle County Felix Grundy (1777–1840), Tennessean senator that served as the thirteenth United States Attorney General 700450063000000000050,063 7002420000000000000420 sq mi
(70031088000000000001,088 km2)
Hamilton County 065 McLeansboro 1821 White County Alexander Hamilton (1755–1804), first United States Secretary of the Treasury 70038457000000000008,457 7002435000000000000435 sq mi
(70031127000000000001,127 km2)
Hancock County 067 Carthage 1825 Adams County John Hancock (1737–1793), first governor of the Massachusetts colony and president of the Second Continental Congress 700419104000000000019,104 7002795000000000000795 sq mi
(70032059000000000002,059 km2)
Hardin County 069 Elizabethtown 1839 Pope County Hardin County, Kentucky, which was itself named after John Hardin 70034320000000000004,320 7002178000000000000178 sq mi
(7002461000000000000461 km2)
Henderson County 071 Oquawka 1841 Warren County Henderson County, Kentucky, which was itself named after Richard Henderson 70037331000000000007,331 7002379000000000000379 sq mi
(7002982000000000000982 km2)
Henry County 073 Cambridge 1825 Fulton County Patrick Henry (1736-1799), American Revolutionary War figure and first and sixth Governor of Virginia 700450486000000000050,486 7002823000000000000823 sq mi
(70032132000000000002,132 km2)
Iroquois County 075 Watseka 1833 Vermilion County Iroquois Native Americans 700429718000000000029,718 70031116000000000001,116 sq mi
(70032890000000000002,890 km2)
Jackson County 077 Murphysboro 1816 Randolph County and Johnson County Andrew Jackson (1767-1845), seventh President of the United States, United States Senator from Tennessee, and general in the War of 1812 700460218000000000060,218 7002588000000000000588 sq mi
(70031523000000000001,523 km2)
Jasper County 079 Newton 1831 Clay and Crawford County Sgt. William Jasper (c. 1750-1779), American Revolutionary War soldier popularized by Parson Weems 70039698000000000009,698 7002494000000000000494 sq mi
(70031279000000000001,279 km2)
Jefferson County 081 Mount Vernon 1819 Edwards and White County Thomas Jefferson (1743-1826), third President of the United States, second Vice President of the United States, Governor of Virginia, and one of the foremost Founding Fathers of the United States 700438827000000000038,827 7002571000000000000571 sq mi
(70031479000000000001,479 km2)
Jersey County 083 Jerseyville 1839 Greene County State of New Jersey, from which many early settlers hailed 700422985000000000022,985 7002369000000000000369 sq mi
(7002956000000000000956 km2)
Jo Daviess County 085 Galena 1827 Henry, Mercer, and Putnam County Joseph Hamilton Daveiss (1774-1811), commander of the Indiana Dragoons at the Battle of Tippecanoe 700422678000000000022,678 7002601000000000000601 sq mi
(70031557000000000001,557 km2)
Johnson County 087 Vienna 1812 Randolph County Richard Mentor Johnson (abt. 1780-1850), ninth Vice President of the United States and United States Senator form Kentucky 700412582000000000012,582 7002346000000000000346 sq mi
(7002896000000000000896 km2)
Kane County 089 Geneva 1836 LaSalle County Elias Kane (1794-1835), United States Senator from Illinois 7005515269000000000515,269 7002521000000000000521 sq mi
(70031349000000000001,349 km2)
Kankakee County 091 Kankakee 1853 Iroquois and Will County Kankakee River 7005113449000000000113,449 7002678000000000000678 sq mi
(70031756000000000001,756 km2)
Kendall County 093 Yorkville 1841 LaSalle and Kane County Amos Kendall (1789-1869), United States Postmaster General under Presidents Andrew Jackson and Martin Van Buren 7005114736000000000114,736 7002321000000000000321 sq mi
(7002831000000000000831 km2)
Knox County 095 Galesburg 1825 Fulton County Gen. Henry Knox (1750-1806), American Revolutionary War general and first United States Secretary of War 700452919000000000052,919 7002716000000000000716 sq mi
(70031854000000000001,854 km2)
Lake County 097 Waukegan 1839 McHenry County Lake Michigan 7005703462000000000703,462 7002448000000000000448 sq mi
(70031160000000000001,160 km2)
LaSalle County 099 Ottawa 1831 Putnam and Tazewell County Sieur de la Salle (1643-1687), French explorer of the Great Lakes. 7005113924000000000113,924 70031135000000000001,135 sq mi
(70032940000000000002,940 km2)
Lawrence County 101 Lawrenceville 1821 Crawford and Edwards County Capt. James Lawrence (1781-1813), commander of the USS Chesapeake in the War of 1812. Famous for his command "Don't give up the ship!" 700416833000000000016,833 7002372000000000000372 sq mi
(7002963000000000000963 km2)
Lee County 103 Dixon 1839 Ogle County "Light Horse" Henry Lee III (1756-1818), American Revolutionary War officer and ninth Governor of Virginia 700436031000000000036,031 7002725000000000000725 sq mi
(70031878000000000001,878 km2)
Livingston County 105 Pontiac 1837 LaSalle and McLean County Edward Livingston (1764-1836), prominent jurist, Congressman from New York and Louisiana, and U.S. Secretary of State from 1831 to 1833. 700438950000000000038,950 70031044000000000001,044 sq mi
(70032704000000000002,704 km2)
Logan County 107 Lincoln 1839 Sangamon County John Logan, a country doctor and early settler, and the father of John A. Logan. 700430305000000000030,305 7002618000000000000618 sq mi
(70031601000000000001,601 km2)
Macon County 115 Decatur 1829 Shelby County Nathaniel Macon (1758-1837), sixth Speaker of the United States House of Representatives and United States Senator from North Carolina. 7005110768000000000110,768 7002581000000000000581 sq mi
(70031505000000000001,505 km2)
Macoupin County 117 Carlinville 1829 Greene County Native American word Macoupin, meaning American lotus 700447765000000000047,765 7002864000000000000864 sq mi
(70032238000000000002,238 km2)
Madison County 119 Edwardsville 1812 St. Clair County and Randolph County James Madison (1751-1836), fourth President of the United States and principal author of the Constitution of the United States. 7005269282000000000269,282 7002725000000000000725 sq mi
(70031878000000000001,878 km2)
Marion County 121 Salem 1823 Fayette and Jefferson County Francis Marion (c. 1732-1795), general in the American Revolutionary War known as "The Swamp Fox" 700439437000000000039,437 7002572000000000000572 sq mi
(70031481000000000001,481 km2)
Marshall County 123 Lacon 1839 Putnam County John Marshall (1755-1835), fourth and longest-serving Chief Justice of the United States, wrote opinion in Marbury v. Madison establishing the principle of judicial review 700412640000000000012,640 7002386000000000000386 sq mi
(70031000000000000001,000 km2)
Mason County 125 Havana 1841 Tazewell and Menard County Named after Mason County, Kentucky, itself named after George Mason 700414666000000000014,666 7002539000000000000539 sq mi
(70031396000000000001,396 km2)
Massac County 127 Metropolis 1843 Pope and Johnson County Fort Massac, a colonial-era fort on the Ohio River 700415429000000000015,429 7002239000000000000239 sq mi
(7002619000000000000619 km2)
McDonough County 109 Macomb 1826 Schuyler County Commodore Thomas Macdonough (1783-1825), commander of American naval forces at the Battle of Plattsburgh 700432612000000000032,612 7002589000000000000589 sq mi
(70031526000000000001,526 km2)
McHenry County 111 Woodstock 1836 Cook and LaSalle County Major William McHenry (c. 1771-1835), officer in during several campaigns against Native Americans and member of the Illinois legislature 7005308760000000000308,760 7002604000000000000604 sq mi
(70031564000000000001,564 km2)
McLean County 113 Bloomington 1830 Tazewell County John McLean (1791-1830), United States Representative and United States Senator from Illinois (the latter from 1824-1825 and 1829-1830) 7005169572000000000169,572 70031184000000000001,184 sq mi
(70033067000000000003,067 km2)
Menard County 129 Petersburg 1839 Sangamon County Pierre Menard (1766-1844), prominent early settler and first Lieutenant Governor of Illinois 700412705000000000012,705 7002314000000000000314 sq mi
(7002813000000000000813 km2)
Mercer County 131 Aledo 1825 Schuyler County Hugh Mercer (1726-1777), British officer in the Seven Years' War and general in the Continental Army during the American Revolutionary War 700416434000000000016,434 7002561000000000000561 sq mi
(70031453000000000001,453 km2)
Monroe County 133 Waterloo 1816 Randolph County and St. Clair County James Monroe (1758-1831), seventh United States Secretary of State, eighth United States Secretary of War, Governor of Virginia, and fifth President of the United States 700432957000000000032,957 7002388000000000000388 sq mi
(70031005000000000001,005 km2)
Montgomery County 135 Hillsboro 1821 Bond and Madison County Gen. Richard Montgomery (1738-1775), brigadier-general in the Continental Army who led the unsuccessful invasion of Canada 700430104000000000030,104 7002704000000000000704 sq mi
(70031823000000000001,823 km2)
Morgan County 137 Jacksonville 1823 Sangamon County Gen. Daniel Morgan (1736-1802), successful tactician in the American Revolutionary War and later United States Representative from Virginia 700435547000000000035,547 7002569000000000000569 sq mi
(70031474000000000001,474 km2)
Moultrie County 139 Sullivan 1843 Shelby and Macon County Gen. William Moultrie (1730-1805), American Revolutionary War general and Governor of South Carolina 700414846000000000014,846 7002336000000000000336 sq mi
(7002870000000000000870 km2)
Ogle County 141 Oregon 1836 Jo Daviess Joseph Ogle (1737-1821), early settler in southwest Illinois, who helped found the first Methodist church in Illinois 700453497000000000053,497 7002759000000000000759 sq mi
(70031966000000000001,966 km2)
Peoria County 143 Peoria 1825 Fulton County The Peoria Native American tribe 7005186494000000000186,494 7002620000000000000620 sq mi
(70031606000000000001,606 km2)
Perry County 145 Pinckneyville 1827 Randolph and Jackson County Commodore Oliver Hazard Perry (1785-1819), American naval officer who led the victorious American forces at the Battle of Lake Erie 700422350000000000022,350 7002441000000000000441 sq mi
(70031142000000000001,142 km2)
Piatt County 147 Monticello 1841 DeWitt and Macon County John Piatt, the patriarch of a prominent settler family in the early history of the county 700416729000000000016,729 7002440000000000000440 sq mi
(70031140000000000001,140 km2)
Pike County 149 Pittsfield 1821 Madison, Bond, and Clark County Zebulon Pike (1779-1813), early explorer of the American Southwest, namesake of Pikes Peak 700416430000000000016,430 7002830000000000000830 sq mi
(70032150000000000002,150 km2)
Pope County 151 Golconda 1816 Gallatin and Johnson County Nathaniel Pope (1784-1850), early Delegate from Illinois Territory to Congress and judge on the United States District Court for the District of Illinois 70034470000000000004,470 7002371000000000000371 sq mi
(7002961000000000000961 km2)
Pulaski County 153 Mound City 1843 Alexander and Johnson County Gen. Casimir Pulaski (1745-1779), Polish American general of cavalry in the American Revolutionary War 70036161000000000006,161 7002201000000000000201 sq mi
(7002521000000000000521 km2)
Putnam County 155 Hennepin 1825 Fulton County Gen. Israel Putnam (1718-1790), commander of American forces at the Battle of Bunker Hill 70036006000000000006,006 7002160000000000000160 sq mi
(7002414000000000000414 km2)
Randolph County 157 Chester 1795 St. Clair County Edmund Randolph (1753-1813), first Attorney General of the United States, and briefly United States Secretary of State 700433476000000000033,476 7002578000000000000578 sq mi
(70031497000000000001,497 km2)
Richland County 159 Olney 1841 Clay and Lawrence County Richland County, Ohio, itself named for its rich soil 700416233000000000016,233 7002360000000000000360 sq mi
(7002932000000000000932 km2)
Rock Island County 161 Rock Island 1831 Jo Daviess County Rock Island 7005147546000000000147,546 7002427000000000000427 sq mi
(70031106000000000001,106 km2)
Saline County 165 Harrisburg 1847 Gallatin County Salt springs within the county 700424913000000000024,913 7002383000000000000383 sq mi
(7002992000000000000992 km2)
Sangamon County 167 Springfield 1821 Madison and Bond County Sangamon River 7005197465000000000197,465 7002868000000000000868 sq mi
(70032248000000000002,248 km2)
Schuyler County 169 Rushville 1825 Pike and Fulton County Gen. Philip Schuyler (1733-1804), American Revolutionary War general and United States Senator from New York 70037544000000000007,544 7002437000000000000437 sq mi
(70031132000000000001,132 km2)
Scott County 171 Winchester 1839 Morgan County Scott County, Kentucky, itself named after Charles Scott 70035355000000000005,355 7002251000000000000251 sq mi
(7002650000000000000650 km2)
Shelby County 173 Shelbyville 1827 Fayette County Isaac Shelby (1750-1826), soldier in the American Revolutionary War and War of 1812, and first and fifth Governor of Kentucky 700422363000000000022,363 7002759000000000000759 sq mi
(70031966000000000001,966 km2)
St. Clair County 163 Belleville 1790 original two counties Arthur St. Clair (1737-1818), major general in the American Revolutionary War and first Governor of the Northwest Territory 7005270056000000000270,056 7002664000000000000664 sq mi
(70031720000000000001,720 km2)
Stark County 175 Toulon 1839 Knox and Putnam County Gen. John Stark (1728-1822), general in the American Revolutionary War, called the "Hero of Bennington" 70035994000000000005,994 7002288000000000000288 sq mi
(7002746000000000000746 km2)
Stephenson County 177 Freeport 1837 Jo Daviess and Winnebago County Benjamin Stephenson (1769-1822), representative of Illinois Territory in the United States Congress from 1814 to 1816 700447711000000000047,711 7002564000000000000564 sq mi
(70031461000000000001,461 km2)
Tazewell County 179 Pekin 1827 Sangamon County Littleton Waller Tazewell (1774-1860), United States Senator from (and later governor of) Virginia 7005135394000000000135,394 7002649000000000000649 sq mi
(70031681000000000001,681 km2)
Union County 181 Jonesboro 1818 Johnson County The federal union of the states 700417808000000000017,808 7002416000000000000416 sq mi
(70031077000000000001,077 km2)
Vermilion County 183 Danville 1826 Edgar County The Vermilion River 700481625000000000081,625 7002899000000000000899 sq mi
(70032328000000000002,328 km2)
Wabash County 185 Mount Carmel 1824 Edwards County The Wabash River 700411947000000000011,947 7002224000000000000224 sq mi
(7002580000000000000580 km2)
Warren County 187 Monmouth 1825 Schuyler County Joseph Warren (1741-1775), played a role in American Patriot movements, a prominent early fatality in the American Revolutionary War 700417707000000000017,707 7002543000000000000543 sq mi
(70031406000000000001,406 km2)
Washington County 189 Nashville 1818 St. Clair County George Washington (1732-1799), commander-in-chief of American forces in the American Revolutionary War and first President of the United States 700414716000000000014,716 7002563000000000000563 sq mi
(70031458000000000001,458 km2)
Wayne County 191 Fairfield 1819 Edwards County Gen. "Mad" Anthony Wayne (1745-1796), major general in the United States Army in the American Revolutionary War and the Northwest Indian War 700416760000000000016,760 7002714000000000000714 sq mi
(70031849000000000001,849 km2)
White County 193 Carmi 1815 Gallatin County Isaac White (1776-1811), resident of Illinois who enlisted in the Indiana militia and was killed at the Battle of Tippecanoe 700414665000000000014,665 7002495000000000000495 sq mi
(70031282000000000001,282 km2)
Whiteside County 195 Morrison 1836 Jo Daviess and Henry County Samuel Whiteside (1783-1868), state legislator and militia leader 700458498000000000058,498 7002685000000000000685 sq mi
(70031774000000000001,774 km2)
Will County 197 Joliet 1836 Cook and Iroquois County Conrad Will (1779-1835), physician, local businessman and longtime member of the state legislature 7005677560000000000677,560 7002837000000000000837 sq mi
(70032168000000000002,168 km2)
Williamson County 199 Marion 1839 Franklin County Hugh Williamson (1735-1819), delegate from North Carolina to the Philadelphia Convention 700466357000000000066,357 7002424000000000000424 sq mi
(70031098000000000001,098 km2)
Winnebago County 201 Rockford 1836 Jo Daviess Winnebago Native Americans 7005295266000000000295,266 7002514000000000000514 sq mi
(70031331000000000001,331 km2)
Woodford County 203 Eureka 1841 Tazewell and McLean County Gen. William Woodford (1734-1780), brigadier general in the American Revolutionary War who died while a British prisoner 700438664000000000038,664 7002528000000000000528 sq mi
(70031368000000000001,368 km2)

Read more about this topic:  List Of Counties In Illinois

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