Founded in 1825, Hancock County is one of 102 counties in the state of Illinois. Historically, Hancock County was formed from Adams County. The city of Carthage is the county seat. With FIPS code of 67, Hancock County has a population of 17,400 and area of 793 square miles (2,054 km2).
List of all cities in Hancock County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Adrian, IL | 62330 | 217 |
| Augusta, IL | 62311 | 217 |
| Basco, IL | 62313 | 217 |
| Bentley, IL | 62321 | 217 |
| Birmingham, IL | 62367 | 309 |
| Bowen, IL | 62316 | 217 |
| Burnside, IL | 62330 | 217 |
| Carthage, IL | 62321 | 217 |
| Colmar, IL | 62367 | 309 |
| Colusa, IL | 62329 | 217 |
| Dallas City, IL | 62330 | 217 |
| Denver, IL | 62321 | 217 |
| Elvaston, IL | 62334 | 217 |
| Ferris, IL | 62336 | 217 |
| Fountain Green, IL | 62321 | 217 |
| Hamilton, IL | 62341 | 217 |
| Harmony, IL | 62321 | 217 |
| La Crosse, IL | 61450 | 217 |
| La Harpe, IL | 61450 | 217 |
| McCall, IL | 62321 | 217 |
| Nauvoo, IL | 62354 | 217 |
| Niota, IL | 62358 | 217 |
| Pilot Grove, IL | 62330 | 217 |
| Plymouth, IL | 62367 | 309 |
| Pontoosuc, IL | 62330 | 217 |
| Stillwell, IL | 62380 | 217 |
| Sutter, IL | 62373 | 217 |
| Warsaw, IL | 62379 | 217 |
| Webster, IL | 62321 | 217 |
| West Point, IL | 62380 | 217 |