ZIP Code | ZIP Code City/Town | ZIP Type | Average Adjusted Income(2021) |
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| Montgomery City | Standard | $358,940 |
| Williamsburg | Standard | $184,100 |
| Hartsburg | Standard | $372,230 |
| Holts Summit | Standard | $417,450 |
| Mokane | Standard | $156,570 |
| New Bloomfield | Standard | $286,260 |
| Portland | Standard | $114,980 |
| Rhineland | Standard | $148,800 |
| Steedman | Standard | $130,680 |
| Tebbetts | Standard | $158,230 |
| Jefferson City | Standard | $384,010 |
| Columbia | Standard | $524,290 |
| Auxvasse | Standard | $415,900 |
| Fulton | Standard | $373,050 |
| Kingdom City | Standard | $175,440 |
| Martinsburg | Standard | $156,850 |
Source: US Internal Revenue Service