Zip Code | City | Population |
|---|---|---|
| 04103 | Portland | 31,892 |
| 04106 | South Portland | 26,873 |
| 04074 | Scarborough | 22,098 |
| 04011 | Brunswick | 21,691 |
| 04092 | Westbrook | 20,339 |
| 04062 | Windham | 18,648 |
| 04038 | Gorham | 17,999 |
| 04101 | Portland | 17,832 |
| 04102 | Portland | 17,501 |
| 04105 | Falmouth | 12,436 |
| 04107 | Cape Elizabeth | 9,519 |
| 04096 | Yarmouth | 8,984 |
| 04032 | Freeport | 8,700 |
| 04039 | Gray | 7,893 |
| 04084 | Standish | 7,345 |
| 04021 | Cumberland Center | 6,633 |
| 04260 | New Gloucester | 5,705 |
| 04009 | Bridgton | 5,366 |
| 04071 | Raymond | 4,958 |
| 04079 | Harpswell | 4,250 |
| 04097 | North Yarmouth | 4,106 |
| 04055 | Naples | 3,928 |
| 04015 | Casco | 3,657 |
| 04085 | Steep Falls | 3,107 |
| 04040 | Harrison | 3,044 |
| 04029 | Sebago | 2,011 |
| 04110 | Cumberland Foreside | 1,810 |
| 04069 | Pownal | 1,600 |
| 04108 | Peaks Island | 859 |
| 04091 | West Baldwin | 740 |
| 04066 | Orrs Island | 644 |
| 04017 | Chebeague Island | 597 |
| 04024 | East Baldwin | 432 |
| 04050 | Long Island | 282 |
| 04109 | Portland | 141 |
| 04003 | Bailey Island | 123 |
| 04057 | North Bridgton | 105 |
| 04019 | Cliff Island | 55 |