Founded in 1855, Nemaha County is one of 105 counties in the state of Kansas. Historically, Nemaha County was one of the original 36 counties (Formerly Dorn County). The city of Seneca is the county seat. With FIPS code of 131, Nemaha County has a population of 10,216 and area of 719 square miles (1,862 km2).
List of all cities in Nemaha County, KS alphabetically
| City/Town | Postal Code | Area Code |
| Baileyville, KS | 66404 | 785 |
| Bern, KS | 66408 | 785 |
| Centralia, KS | 66415 | 785 |
| Corning, KS | 66417 | 785 |
| Goff, KS | 66428 | 785 |
| Kelly, KS | 66538 | 785 |
| Oneida, KS | 66522 | 785 |
| Sabetha, KS | 66534 | 785 |
| Saint Benedict, KS | 66538 | 785 |
| Seneca, KS | 66538 | 785 |
| Wetmore, KS | 66550 | 785 |