| Zip Code | City | Population ↓ |
|---|---|---|
| 4530 | Bath | 11,584 |
| 4086 | Topsham | 9,566 |
| 4357 | Richmond | 3,536 |
| 4287 | Bowdoin | 3,158 |
| 4579 | Woolwich | 3,112 |
| 4008 | Bowdoinham | 3,083 |
| 4562 | Phippsburg | 1,961 |
| 4548 | Georgetown | 868 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Sagadahoc County, Maine (US Census).