| ZIP Code | ZIP Code City/Town | ZIP Type | Average Adjusted Income(2021) |
|---|
| Bailey Island | Standard | $404,270 |
| Bridgton | Standard | $392,330 |
| Brunswick | Standard | $406,540 |
| Casco | Standard | $848,610 |
| Chebeague Island | Standard | $302,270 |
| Cumberland Center | Standard | $510,490 |
| East Baldwin | Standard | $170,700 |
| Sebago | Standard | $304,480 |
| Freeport | Standard | $542,960 |
| Gorham | Standard | $438,730 |
| Gray | Standard | $343,380 |
| Harrison | Standard | $626,100 |
| Long Island | Standard | $216,930 |
| Naples | Standard | $450,060 |
| Windham | Standard | $437,520 |
| Orrs Island | Standard | $381,780 |
| Pownal | Standard | $399,770 |
| Raymond | Standard | $453,750 |
| Scarborough | Standard | $445,940 |
| Harpswell | Standard | $491,270 |
| Standish | Standard | $424,610 |
| Steep Falls | Standard | $336,400 |
| West Baldwin | Standard | $174,810 |
| Westbrook | Standard | $373,900 |
| Yarmouth | Standard | $680,390 |
| North Yarmouth | Standard | $438,860 |
| Portland | Standard | $779,540 |
| Portland | Standard | $491,630 |
| Portland | Standard | $385,040 |
| Falmouth | Standard | $643,680 |
| South Portland | Standard | $443,130 |
| Cape Elizabeth | Standard | $654,210 |
| Peaks Island | Standard | $425,290 |
| Cumberland Foreside | Standard | $863,240 |
| New Gloucester | Standard | $393,760 |
Source: US Internal Revenue Service