ZIP Code | ZIP Code City/Town | ZIP Type | Average Adjusted Income(2021) |
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| Darien | Standard | $438,500 |
| Whitewater | Standard | $411,580 |
| Albany | Standard | $297,100 |
| Avalon | Standard | $182,980 |
| Beloit | Standard | $430,170 |
| Brodhead | Standard | $339,700 |
| Brooklyn | Standard | $411,650 |
| Clinton | Standard | $543,180 |
| Edgerton | Standard | $434,520 |
| Evansville | Standard | $327,730 |
| Fort Atkinson | Standard | $495,550 |
| Janesville | Standard | $849,640 |
| Janesville | Standard | $418,020 |
| Janesville | Standard | $419,800 |
| Milton | Standard | $481,840 |
| Orfordville | Standard | $317,630 |
| Sharon | Standard | $280,430 |
Source: US Internal Revenue Service