Grundy County, Iowa ZIP Codes
- ZIP records
9 - Cities represented
9 - Sum of listed ZIP population estimates
11,663
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 | 50638 | Grundy Center | 3,441 |
| 2 | 50669 | Reinbeck | 2,439 |
| 3 | 50624 | Dike | 1,855 |
| 4 | 50621 | Conrad | 1,601 |
| 5 | 50680 | Wellsburg | 1,027 |
| 6 | 50642 | Holland | 577 |
| 7 | 50609 | Beaman | 377 |
| 8 | 50673 | Stout | 250 |
| 9 | 50657 | Morrison | 96 |
Cities in Grundy 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.