| Zip Code | City | Population ↓ |
|---|---|---|
| 4103 | Portland | 31,892 |
| 4106 | South Portland | 26,873 |
| 4074 | Scarborough | 22,098 |
| 4011 | Brunswick | 21,691 |
| 4092 | Westbrook | 20,339 |
| 4062 | Windham | 18,648 |
| 4038 | Gorham | 17,999 |
| 4101 | Portland | 17,832 |
| 4102 | Portland | 17,501 |
| 4105 | Falmouth | 12,436 |
| 4107 | Cape Elizabeth | 9,519 |
| 4096 | Yarmouth | 8,984 |
| 4032 | Freeport | 8,700 |
| 4039 | Gray | 7,893 |
| 4084 | Standish | 7,345 |
| 4021 | Cumberland Center | 6,633 |
| 4260 | New Gloucester | 5,705 |
| 4009 | Bridgton | 5,366 |
| 4071 | Raymond | 4,958 |
| 4079 | Harpswell | 4,250 |
| 4097 | North Yarmouth | 4,106 |
| 4055 | Naples | 3,928 |
| 4015 | Casco | 3,657 |
| 4085 | Steep Falls | 3,107 |
| 4040 | Harrison | 3,044 |
| 4029 | Sebago | 2,011 |
| 4110 | Cumberland Foreside | 1,810 |
| 4069 | Pownal | 1,600 |
| 4108 | Peaks Island | 859 |
| 4091 | West Baldwin | 740 |
| 4066 | Orrs Island | 644 |
| 4017 | Chebeague Island | 597 |
| 4024 | East Baldwin | 432 |
| 4050 | Long Island | 282 |
| 4109 | Portland | 141 |
| 4003 | Bailey Island | 123 |
| 4057 | North Bridgton | 105 |
| 4019 | Cliff Island | 55 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 38 ZCTAs in Cumberland County, Maine (US Census).