Founded on Jan 15, 1851, Clay County is one of 99 counties in the state of Iowa. Historically, Clay County was formed from Native American lands. The city of Spencer is the county seat. With FIPS code of 41, Clay County has a population of 16,440 and area of 569 square miles (1,474 km2).
List of all cities in Clay County, IA alphabetically
| City/Town | Postal Code | Area Code |
| Dickens, IA | 51333 | 712 |
| Everly, IA | 51338 | 712 |
| Fostoria, IA | 51340 | 712 |
| Gillett Grove, IA | 51341 | 712 |
| Greenville, IA | 51343 | 712 |
| Peterson, IA | 51047 | 712 |
| Rossie, IA | 51357 | 712 |
| Royal, IA | 51343 | 712 |
| 51357 | 712 | |
| Spencer, IA | 51301 | 712 |
| Webb, IA | 51366 | 712 |