ZIP Code | ZIP Code City/Town | ZIP Type | Average Adjusted Income(2021) |
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| Baxter | Standard | $242,250 |
| Colfax | Standard | $320,080 |
| Collins | Standard | $160,980 |
| Gilman | Standard | $155,860 |
| Grinnell | Standard | $495,230 |
| Kellogg | Standard | $276,000 |
| Laurel | Standard | $161,320 |
| Lynnville | Standard | $191,350 |
| Melbourne | Standard | $149,380 |
| Mingo | Standard | $251,200 |
| Mitchellville | Standard | $418,920 |
| Monroe | Standard | $332,720 |
| Newton | Standard | $350,130 |
| Prairie City | Standard | $394,230 |
| Reasnor | Standard | $171,530 |
| Rhodes | Standard | $206,400 |
| Sully | Standard | $454,270 |
Source: US Internal Revenue Service