26 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 04901 | Waterville | 27,870 |
| 04330 | Augusta | 26,690 |
| 04345 | Gardiner | 12,579 |
| 04963 | Oakland | 7,524 |
| 04364 | Winthrop | 6,191 |
| 04989 | Vassalboro | 4,592 |
| 04358 | South China | 4,526 |
| 04350 | Litchfield | 3,680 |
| 04259 | Monmouth | 3,610 |
| 04927 | Clinton | 3,385 |
| 04917 | Belgrade | 3,351 |
| 04344 | Farmingdale | 3,017 |
| 04363 | Windsor | 2,690 |
| 04355 | Readfield | 2,651 |
| 04347 | Hallowell | 2,592 |
| 04351 | Manchester | 2,424 |
| 04910 | Albion | 2,204 |
| 04352 | Mount Vernon | 1,716 |
| 04346 | Randolph | 1,610 |
| 04349 | Kents Hill | 1,383 |
| 04284 | Wayne | 1,101 |
| 04265 | North Monmouth | 552 |
| 04360 | Vienna | 536 |
| 04359 | South Gardiner | 298 |
| 04918 | Belgrade Lakes | 0 |
| 04926 | China Village | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 26 ZCTAs in Kennebec County, Maine (US Census).