| Zip Code | Primary City | Secondary City | More Information |
| 04105 | Portland | Portland | Portland population stats |
| 04106 | South Portland | Portland | Portland population stats |
| 04107 | Cape Elizabeth | Portland | Portland population stats |
| 04108 | Peaks Island | Portland | Portland population stats |
| 04110 | Cumberland Foreside | Portland | Portland population stats |
| 04116 | South Portland | Portland | Portland population stats |
| 04105 | Falmouth Foreside | Falmouth Foreside | Falmouth Foreside population stats |
| 04101 | Portland | Portland | Portland population stats |
| 04102 | Portland | Portland | Portland population stats |
| 04103 | Portland | Portland | Portland population stats |
| 04104 | Portland | Portland | Portland population stats |
| 04109 | Portland | Portland | Portland population stats |
| 04112 | Portland | Portland | Portland population stats |
| 04122 | Portland | Portland | Portland population stats |
| 04123 | Portland | Portland | Portland population stats |
| 04124 | Portland | Portland | Portland population stats |