ZIP Code | ZIP Code City/Town | ZIP Type | Average Adjusted Income(2021) |
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| Barrington | Standard | $888,470 |
| Crystal Lake | Standard | $482,640 |
| Cary | Standard | $405,320 |
| Crystal Lake | Standard | $440,220 |
| Fox River Grove | Standard | $364,170 |
| Harvard | Standard | $633,240 |
| Hebron | Standard | $281,580 |
| Island Lake | Standard | $424,770 |
| Mchenry | Standard | $446,150 |
| Mchenry | Standard | $415,650 |
| Richmond | Standard | $522,790 |
| Ringwood | Standard | $352,320 |
| Spring Grove | Standard | $416,800 |
| Wonder Lake | Standard | $306,620 |
| Woodstock | Standard | $507,540 |
| Algonquin | Standard | $347,070 |
| Genoa | Standard | $353,450 |
| Huntley | Standard | $354,760 |
| Marengo | Standard | $390,820 |
| Lake in the Hills | Standard | $526,930 |
| Union | Standard | $432,380 |
| Garden Prairie | Standard | $347,070 |
Source: US Internal Revenue Service