Founded in 1825, Knox County is one of 102 counties in the state of Illinois. Historically, Knox County was formed from Fulton County. The city of Galesburg is the county seat. With FIPS code of 95, Knox County has a population of 49,268 and area of 716 square miles (1,854 km2).
List of all cities in Knox County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Abingdon, IL | 61410 | 309 |
| Altona, IL | 61414 | 309 |
| Appleton, IL | 61428 | 309 |
| Columbia Heights, IL | 61430 | 309 |
| Dahinda, IL | 61428 | 309 |
| Delong, IL | 61436 | 309 |
| East Galesburg, IL | 61430 | 309 |
| Galesburg, IL | 61401 | 309 |
| 61402 | 309 | |
| Gilson, IL | 61436 | 309 |
| Henderson, IL | 61439 | 309 |
| Henderson Grove, IL | 61401 | 309 |
| Hermon, IL | 61458 | 309 |
| Knoxville, IL | 61448 | 309 |
| Maquon, IL | 61458 | 309 |
| Oak Run, IL | 61428 | 309 |
| Oneida, IL | 61467 | 309 |
| Rio, IL | 61472 | 309 |
| Saint Augustine, IL | 61474 | 309 |
| Victoria, IL | 61485 | 309 |
| Wataga, IL | 61488 | 309 |
| Williamsfield, IL | 61489 | 309 |
| Yates City, IL | 61572 | 309 |