Marathon, Iowa ZIP Codes
- ZIP records
1 - Sum of listed ZIP population estimates
380 - Counties represented
1 - Population range
380–380 per ZIP
Population sum includes positive estimates in these ZIP records; it is not an official city population.
Top ZIP Codes by Population
| Rank | ZIP Code | City | County | Population estimate |
|---|---|---|---|---|
| 1 | 50565 | Marathon | Buena Vista | 380 |
Counties represented
All ZIP Codes in Marathon
Methodology: ZIP records are grouped by the source file's primary city and state fields. Population ranges and sums use positive ZIP-level estimates; sums should not be read as official city totals. County links use each record's listed county assignment.