| 1 | Gorham CDP (west) | 8,260 |
| 2 | Unincorporated (north) | 7,284 |
| 3 | Little Falls CDP | 6,956 |
| 4 | South Windham CDP | 6,478 |
| 5 | Portland city (northwest 2) | 6,132 |
| 6 | Gray CDP | 6,110 |
| 7 | Oak Hill CDP (west-northwest) | 5,731 |
| 8 | Portland city (west-northwest 2) | 5,725 |
| 9 | Yarmouth CDP | 5,671 |
| 10 | Unincorporated (south-southeast 2) | 5,496 |
| 11 | Westbrook city (north-northwest) | 5,424 |
| 12 | Oak Hill CDP (east-northeast) | 5,100 |
| 13 | Freeport CDP | 5,075 |
| 14 | Cumberland Center CDP (east-southeast) | 4,988 |
| 15 | Unincorporated (south) | 4,915 |
| 16 | Brunswick CDP (east-northeast) | 4,900 |
| 17 | Portland city (northwest 1) | 4,877 |
| 18 | North Windham CDP (east-southeast) | 4,873 |
| 19 | Unincorporated (southeast 1) | 4,862 |
| 20 | South Portland city (east-southeast) | 4,728 |
| 21 | Portland city (west-southwest 1) | 4,526 |
| 22 | Westbrook city (south) | 4,430 |
| 23 | North Windham CDP (south-southwest) | 4,425 |
| 24 | Oak Hill CDP (south-southeast) | 4,328 |
| 25 | Portland city (west 1) | 4,184 |
| 26 | Unincorporated (south-southeast 1) | 4,174 |
| 27 | Unincorporated (northeast 1) | 4,173 |
| 28 | Cumberland Center CDP (west-northwest) | 4,126 |
| 29 | South Portland city (northeast 2) | 4,084 |
| 30 | Westbrook city (north) | 4,068 |
| 31 | South Portland city (east-northeast) | 4,066 |
| 32 | Unincorporated (southeast 2) | 4,051 |
| 33 | Brunswick CDP (northwest) | 4,014 |
| 34 | Bridgton CDP (south-southwest) | 3,998 |
| 35 | Brunswick CDP (south) | 3,882 |
| 36 | Portland city (south-southwest 1) | 3,786 |
| 37 | South Portland city (west-southwest) | 3,751 |
| 38 | Portland city (west-southwest 2) | 3,724 |
| 39 | Portland city (west-northwest 1) | 3,718 |
| 40 | Unincorporated (west-southwest) | 3,707 |
| 41 | Portland city (south 2) | 3,688 |
| 42 | Unincorporated (east-northeast) | 3,661 |
| 43 | Portland city (north) | 3,626 |
| 44 | Falmouth CDP | 3,595 |
| 45 | Portland city (west 2) | 3,475 |
| 46 | Standish CDP | 3,462 |
| 47 | Brunswick CDP (west-northwest) | 3,461 |
| 48 | South Portland city (northeast 1) | 3,431 |
| 49 | Westbrook city (east-southeast) | 3,426 |
| 50 | South Portland city (south-southwest) | 3,413 |
| 51 | Steep Falls CDP | 3,366 |
| 52 | Cousins Island CDP | 3,335 |
| 53 | South Portland city (west) | 3,307 |
| 54 | Unincorporated (west) | 3,289 |
| 55 | North Windham CDP (northwest) | 3,191 |
| 56 | Portland city (south-southeast 2) | 3,137 |
| 57 | Westbrook city (southwest) | 3,136 |
| 58 | Portland city (south-southwest 2) | 3,035 |
| 59 | Gorham CDP (east) | 2,976 |
| 60 | Brunswick CDP (north) | 2,950 |
| 61 | Unincorporated (northeast 2) | 2,874 |
| 62 | Unincorporated (west-northwest 2) | 2,818 |
| 63 | Unincorporated (east 2) | 2,782 |
| 64 | Naples CDP (northeast) | 2,772 |
| 65 | Dunstan CDP | 2,673 |
| 66 | Portland city (west-southwest 3) | 2,638 |
| 67 | Portland city (south-southeast 1) | 2,569 |
| 68 | Portland city (east-northeast 1) | 2,530 |
| 69 | Unincorporated (northwest 2) | 2,490 |
| 70 | Portland city (northeast 1) | 2,338 |
| 71 | Portland city (northeast 2) | 2,286 |
| 72 | Unincorporated (east 1) | 2,247 |
| 73 | Unincorporated (northwest 3) | 2,221 |
| 74 | Unincorporated (west-northwest 1) | 2,038 |
| 75 | Unincorporated (northwest 1) | 1,759 |
| 76 | Casco CDP | 1,618 |
| 77 | Bridgton CDP (north-northeast) | 1,539 |
| 78 | Portland city (south 1) | 1,481 |
| 79 | Portland city (east-northeast 2) | 1,330 |
| 80 | Naples CDP (southwest) | 1,177 |