Plymouth County, Iowa ZIP Codes
- ZIP records
11 - Cities represented
10 - Sum of listed ZIP population estimates
34,178
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 | 51031 | Le Mars | 12,808 |
| 2 | 51108 | Sioux City | 5,960 |
| 3 | 51109 | Sioux City | 3,606 |
| 4 | 51050 | Remsen | 2,962 |
| 5 | 51001 | Akron | 2,342 |
| 6 | 51028 | Kingsley | 2,191 |
| 7 | 51024 | Hinton | 2,081 |
| 8 | 51038 | Merrill | 1,449 |
| 9 | 51062 | Westfield | 503 |
| 10 | 51008 | Brunsville | 210 |
Cities in Plymouth 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.