Founded in 1855, Franklin County is one of 105 counties in the state of Kansas. Historically, Franklin County was one of the original 36 counties. The city of Ottawa is the county seat. With FIPS code of 59, Franklin County has a population of 25,986 and area of 574 square miles (1,487 km2).
List of all cities in Franklin County, KS alphabetically
| City/Town | Postal Code | Area Code |
| Centropolis, KS | 66067 | 785 |
| Lane, KS | 66042 | 785 |
| Ottawa, KS | 66067 | 785 |
| Pomona, KS | 66076 | 785 |
| Princeton, KS | 66078 | 785 |
| Rantoul, KS | 66079 | 785 |
| Richmond, KS | 66080 | 785 |
| Wellsville, KS | 66092 | 785 |
| Williamsburg, KS | 66095 | 785 |