Founded on Jan 13, 1846, Marshall County is one of 99 counties in the state of Iowa. Historically, Marshall County was formed from Jasper County. The city of Marshalltown is the county seat. With FIPS code of 127, Marshall County has a population of 39,853 and area of 572 square miles (1,481 km2).
List of all cities in Marshall County, IA alphabetically
| City/Town | Postal Code | Area Code |
| Albion, IA | 50005 | 641 |
| Clemons, IA | 50051 | 641 |
| Ferguson, IA | 50078 | 641 |
| Gilman, IA | 50106 | 641 |
| Harvester, IA | 50234 | 641 |
| Haverhill, IA | 50120 | 641 |
| Laurel, IA | 50141 | 641 |
| Le Grand, IA | 50142 | 641 |
| Liscomb, IA | 50148 | 641 |
| Marshalltown, IA | 50158 | 641 |
| Melbourne, IA | 50162 | 641 |
| Minerva, IA | 50005 | 641 |
| Rhodes, IA | 50234 | 641 |
| Saint Anthony, IA | 50239 | 641 |
| State Center, IA | 50247 | 641 |
| Van Cleve, IA | 50162 | 641 |