ZIP Code | ZIP Code City/Town | ZIP Type | Average Adjusted Income(2021) |
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| Masonville | Standard | $193,080 |
| Colesburg | Standard | $161,250 |
| Dundee | Standard | $115,350 |
| Dyersville | Standard | $376,950 |
| Earlville | Standard | $161,750 |
| Edgewood | Standard | $541,550 |
| Greeley | Standard | $141,550 |
| Manchester | Standard | $369,780 |
| New Vienna | Standard | $165,600 |
| Strawberry Point | Standard | $447,500 |
| Worthington | Standard | $163,210 |
| Coggon | Standard | $343,370 |
| Delhi | Standard | $421,800 |
| Hopkinton | Standard | $163,290 |
| Monticello | Standard | $500,440 |
| Ryan | Standard | $192,110 |
Source: US Internal Revenue Service