| Official Zip Code Name | Cromwell |
| Zip Code State | Iowa |
| Primary County: | Union |
| Area Code | 641 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 6 |
| Elevation Range | 1250 ft. |
| Area | 0.258 Sqm. |
| Coordinates(Y,X) | 41.042400, -94.461900 |