Founded in 1855, Atchison County is one of 105 counties in the state of Kansas. Historically, Atchison County was one of the original 36 counties. The city of Atchison is the county seat. With FIPS code of 5, Atchison County has a population of 16,239 and area of 432 square miles (1,119 km2).
List of all cities in Atchison County, KS alphabetically
| City/Town | Postal Code | Area Code |
| Atchison, KS | 66002 | 913 |
| Cummings, KS | 66016 | 913 |
| Effingham, KS | 66023 | 913 |
| Huron, KS | 66041 | 913 |
| Lancaster, KS | 66041 | 913 |
| Muscotah, KS | 66058 | 785 |
| Potter, KS | 66002 | 913 |
| 66077 | 913 |