26 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 4901 | Waterville | 27,431 |
| 4330 | Augusta | 26,517 |
| 4345 | Gardiner | 12,363 |
| 4963 | Oakland | 7,375 |
| 4364 | Winthrop | 6,153 |
| 4989 | Vassalboro | 4,544 |
| 4358 | South China | 4,475 |
| 4350 | Litchfield | 3,635 |
| 4259 | Monmouth | 3,493 |
| 4927 | Clinton | 3,385 |
| 4917 | Belgrade | 3,298 |
| 4344 | Farmingdale | 3,001 |
| 4363 | Windsor | 2,666 |
| 4355 | Readfield | 2,628 |
| 4347 | Hallowell | 2,570 |
| 4351 | Manchester | 2,464 |
| 4910 | Albion | 2,358 |
| 4352 | Mount Vernon | 1,728 |
| 4346 | Randolph | 1,479 |
| 4349 | Kents Hill | 1,343 |
| 4284 | Wayne | 1,096 |
| 4265 | North Monmouth | 645 |
| 4360 | Vienna | 562 |
| 4359 | South Gardiner | 375 |
| 4918 | Belgrade Lakes | 0 |
| 4926 | China Village | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 26 ZCTAs in Kennebec County, Maine (US Census).