Major Intersections
| County | Location | Mile | km | Destinations | Notes |
|---|---|---|---|---|---|
| Union |
SD 50 west | Continuation into South Dakota | |||
| Big Sioux River |
0.000 | 0.000 | Iowa–South Dakota state line | ||
| Plymouth |
Westfield Township | 1.476 | 2.375 | Iowa 12 south (Portland Street) | West end of Iowa 12 overlap |
| Akron | 6.211 | 9.996 | Iowa 12 north (Loess Hills Scenic Byway) | East end of Iowa 12 overlap | |
| America Township | 26.164 | 42.107 | US 75 / US 75 Bus. |
West end of US 75 Bus. overlap. | |
| Le Mars | 27.617 | 44.445 | US 75 Bus. (5th Avenue West) |
East end of US 75 Bus. overlap. | |
| Remsen | 38.985 | 62.740 | Iowa 140 south / CR L14 north | ||
| Cherokee |
Marcus | 47.009 | 75.654 | Iowa 143 north (Ames Avenue) / CR L36 south (D Avenue) | |
| Cherokee Township | 60.432 | 97.256 | US 59 (2nd Street) | ||
| Afton Township | 66.477 | 106.984 | Iowa 7 east | ||
| Buena Vista |
Scott–Lincoln township line |
81.506 | 131.171 | US 71 | |
| Pocahontas |
Pocahontas | 106.203 | 170.917 | Iowa 4 (West 7th Street) | |
| Garfield–Lake township line |
113.202 | 182.181 | Iowa 15 north / CR N65 south | ||
| Humboldt |
Humboldt | 129.201 | 207.929 | US 169 (13th Street) | |
| Humboldt–Wright county line |
Lake–Liberty township line |
142.211 | 228.866 | Iowa 17 north | West end of Iowa 17 overlap |
| Wright |
Goldfield | 145.068 | 233.464 | Iowa 17 south (Locust Street) | East end of Iowa 17 overlap |
| Grant–Lincoln township line |
159.222 | 256.243 | US 69 south | West end of US 69 overlap | |
| Grant–Iowa township line |
161.112 | 259.285 | US 69 north | East end of US 69 overlap | |
| Franklin |
Scott Township | 172.297 | 277.285 | I-35 | |
| Hampton | 182.290 | 293.367 | US 65 (4th Street East) | ||
| Butler |
Allison | 202.526 | 325.934 | Iowa 14 north | West end of Iowa 14 overlap |
| 203.531 | 327.551 | Iowa 14 south | East end of Iowa 14 overlap | ||
| Butler Township | 210.021 | 337.996 | Iowa 188 north | ||
| Bremer |
Washington Township | 217.393 | 349.860 | US 218 / Iowa 27 | |
| Waverly | 219.887 | 353.874 | US 218 Bus. north (20th Street West) |
West end of US 218 Bus. overlap | |
| 220.878 | 355.469 | US 218 Bus. south (Easton Avenue) |
East end of US 218 Bus. overlap | ||
| Jefferson Township | 228.174 | 367.210 | US 63 | ||
| Fayette |
Jefferson Township | 249.741 | 401.919 | Iowa 150 north | West end of Iowa 150 overlap |
| Oelwein | 252.270 | 405.989 | Iowa 150 south (1st Avenue East) | East end of Iowa 150 overlap | |
| Putnam Township | 266.114 | 428.269 | Iowa 187 | Roundabout, installed in 2009 | |
| Clayton |
Strawberry Point | 272.846 | 439.103 | Iowa 13 north (Elkader Street) | West end of Iowa 13 overlap |
| Clayton–Dubuque county line |
Lodomillo–Honey Creek township line |
277.588 | 446.735 | Iowa 13 south | East end of Iowa 13 overlap |
| Delaware |
Elk Township | 284.178 | 457.340 | Iowa 38 south | |
| Dubuque |
Luxemburg | 300.420 | 483.479 | US 52 north / Iowa 136 south (Andre Street) | West end of US 52 overlap |
| Dubuque | 323.102 | 519.982 | Iowa 32 south (Northwest Arterial) | ||
| 326.163 | 524.908 | US 52 south / US 61 / US 151 | Eastern terminus; east end of US 52 overlap | ||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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Read more about this topic: Iowa Highway 3
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