| ZIP Code | ZIP Code City/Town | ZIP Type | Average Adjusted Income(2021) |
|---|
| Delmar | Standard | $335,500 |
| Maquoketa | Standard | $445,050 |
| Miles | Standard | $138,690 |
| Preston | Standard | $156,770 |
| Sabula | Standard | $143,630 |
| Baldwin | Standard | $148,730 |
| Lost Nation | Standard | $137,720 |
| Oxford Junction | Standard | $131,100 |
| Bryant | Standard | $142,480 |
| Calamus | Standard | $150,410 |
| Camanche | Standard | $272,920 |
| Charlotte | Standard | $168,610 |
| Clinton | Standard | $393,110 |
| De Witt | Standard | $420,970 |
| Goose Lake | Standard | $148,470 |
| Grand Mound | Standard | $137,320 |
| Wheatland | Standard | $154,010 |
Source: US Internal Revenue Service