Founded on Jan 15, 1851, Cass County is one of 99 counties in the state of Iowa. Historically, Cass County was formed from Pottawattamie County. The city of Atlantic is the county seat. With FIPS code of 29, Cass County has a population of 13,050 and area of 564 square miles (1,461 km2).
List of all cities in Cass County, IA alphabetically
| City/Town | Postal Code | Area Code |
| Anita, IA | 50020 | 712 |
| Atlantic, IA | 50022 | 712 |
| Berea, IA | 50020 | 712 |
| Cumberland, IA | 50843 | 712 |
| Griswold, IA | 51535 | 712 |
| Lewis, IA | 51544 | 712 |
| Lorah, IA | 50022 | 712 |
| Marne, IA | 51552 | 712 |
| Massena, IA | 50853 | 712 |
| Wiota, IA | 50274 | 712 |