| Official Zip Code Name | Spencer |
| Zip Code State | Iowa |
| Primary County: | Clay |
| Area Code | 712 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 6 |
| Elevation Range | 1303 ft. |
| Area | 157.668 Sqm. |
| Coordinates(Y,X) | 43.136831, -95.151154 |