Founded in 1855, Lyon County is one of 105 counties in the state of Kansas. Historically, Lyon County was one of the original 36 counties (Formerly Breckenridge County). The city of Emporia is the county seat. With FIPS code of 111, Lyon County has a population of 31,998 and area of 851 square miles (2,204 km2).
List of all cities in Lyon County, KS alphabetically
| City/Town | Postal Code | Area Code |
| Admire, KS | 66830 | 620 |
| Allen, KS | 66833 | 620 |
| Americus, KS | 66835 | 620 |
| Bushong, KS | 66833 | 620 |
| Emporia, KS | 66801 | 620 |
| Hartford, KS | 66854 | 620 |
| Neosho Rapids, KS | 66864 | 620 |
| Olpe, KS | 66865 | 620 |
| Reading, KS | 66868 | 620 |