Founded on Dec 22, 1856, Hamilton County is one of 99 counties in the state of Iowa. Historically, Hamilton County was formed from Webster County. The city of Webster City is the county seat. With FIPS code of 79, Hamilton County has a population of 14,887 and area of 577 square miles (1,494 km2).
List of all cities in Hamilton County, IA alphabetically
| City/Town | Postal Code | Area Code |
| Blairsburg, IA | 50034 | 515 |
| Ellsworth, IA | 50075 | 515 |
| Jewell, IA | 50130 | 515 |
| Kamrar, IA | 50132 | 515 |
| Randall, IA | 50231 | 515 |
| Stanhope, IA | 50246 | 515 |
| Stratford, IA | 50249 | 515 |
| Webster City, IA | 50595 | 515 |
| Williams, IA | 50271 | 515 |