Cass County, Iowa ZIP Codes
- ZIP records
8 - Cities represented
8 - Sum of listed ZIP population estimates
13,872
Population sum includes positive estimates in these ZIP records; it is not an official county population.
Top ZIP Codes by Population
| Rank | ZIP Code | City | Population estimate |
|---|---|---|---|
| 1 | 50022 | Atlantic | 8,526 |
| 2 | 51535 | Griswold | 1,697 |
| 3 | 50020 | Anita | 1,197 |
| 4 | 51544 | Lewis | 793 |
| 5 | 50853 | Massena | 716 |
| 6 | 50843 | Cumberland | 540 |
| 7 | 50274 | Wiota | 234 |
| 8 | 51552 | Marne | 169 |
Cities in Cass County
ZIP Directory
Methodology: Records are grouped by the source file's listed county and state. Population sums add positive ZIP-level estimates and are not official county totals; city counts use distinct city labels in the source.