ZIP Code | ZIP Code City/Town | ZIP Type | Average Adjusted Income(2021) |
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| Bear | Standard | $343,360 |
| Newark | Standard | $343,570 |
| Claymont | Standard | $433,920 |
| Hockessin | Standard | $453,190 |
| Middletown | Standard | $346,220 |
| Newark | Standard | $391,010 |
| Newark | Standard | $358,840 |
| New Castle | Standard | $352,690 |
| Townsend | Standard | $345,440 |
| Yorklyn | Standard | $568,000 |
| Wilmington | Standard | $1,159,570 |
| Wilmington | Standard | $405,030 |
| Wilmington | Standard | $436,080 |
| Wilmington | Standard | $404,210 |
| Wilmington | Standard | $463,850 |
| Wilmington | Standard | $645,520 |
| Wilmington | Standard | $1,017,790 |
| Wilmington | Standard | $374,500 |
| Wilmington | Standard | $342,980 |
| Wilmington | Standard | $360,730 |
| Clayton | Standard | $282,780 |
| Smyrna | Standard | $349,300 |
Source: US Internal Revenue Service