County ZIP codes · Maine · FIPS 23011
Kennebec County, ME ZIP Codes
Kennebec County, Maine has 35 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 27 residential and 8 for PO boxes or a single organization. 26 of the residential ones lie mainly in Kennebec County and 1 mainly in a neighboring county; 1 cross the county line. Median household income ranges from $54,775 in 04330 (Augusta) to $96,309 in 04358 (South China) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Kennebec County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $66,574 and $86,470.
They carry 27 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 27 residential ZIP codes in Kennebec County
26 ZIP codes lie mainly in Kennebec County; 1 more reaches into it from a neighboring county and follows the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 04901 | Waterville | 27,870 | 354 | $57k | $205k | 100% |
| 04330 | Augusta | 26,690 | 228 | $55k | $217k | 100% |
| 04345 | Gardiner | 12,579 | 175 | $77k | $243k | 100% |
| 04963 | Oakland | 7,524 | 147 | $78k | $247k | 100% |
| 04364 | Winthrop | 6,191 | 199 | $87k | $295k | 100% |
| 04989 | Vassalboro | 4,592 | 104 | $72k | $244k | 100% |
| 04358 | South China | 4,526 | 91 | $96k | $240k | 100% |
| 04350 | Litchfield | 3,680 | 98 | $85k | $244k | 100% |
| 04259 | Monmouth | 3,610 | 124 | $84k | $298k | 100% |
| 04927 | Clinton | 3,385 | 77 | $72k | $187k | 100% |
| 04917 | Belgrade | 3,351 | 79 | $88k | $312k | 100% |
| 04344 | Farmingdale | 3,017 | 268 | $72k | $250k | 100% |
| 04363 | Windsor | 2,690 | 78 | $63k | $229k | 100% |
| 04355 | Readfield | 2,651 | 91 | $87k | $326k | 100% |
| 04347 | Hallowell | 2,592 | 442 | $68k | $295k | 100% |
| 04351 | Manchester | 2,424 | 113 | $92k | $300k | 100% |
| 04910 | Albion | 2,204 | 57 | $62k | $231k | 100% |
| 04352 | Mount Vernon | 1,716 | 45 | $74k | $264k | 100% |
| 04346 | Randolph | 1,610 | 754 | $67k | $174k | 100% |
| 04349 | Kents Hill | 1,383 | 47 | $60k | $258k | 100% |
| 04284 | Wayne | 1,101 | 60 | $93k | $363k | 100% |
| 04265 | North Monmouth | 552 | 94 | $44k | $170k | 100% |
| 04360 | Vienna | 536 | 22 | $76k | $276k | 100% |
| 04359 | South Gardiner | 298 | 400 | – | $187k | 100% |
| 04918 | Belgrade Lakes | no residents | 0 | – | – | 100% |
| 04926 | China Village | no residents | 0 | – | – | 100% |
Partly in Kennebec County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 04988 | Unity | 1,894 | 38 | $63k | $204k | 21% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
1 ZIP code of Kennebec County extends into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Kennebec | Elsewhere |
|---|---|---|
| 04988 | 21% | Waldo County 79% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Kennebec County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Kennebec County's ZIP codes use 3 prefixes: 042, 043 and 049.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 042 | Southern, ME (SCF 040) | 3 | 60 |
| 043 | Southern, ME (SCF 040) | 20 | 26 |
| 049 | Eastern, ME (SCF 044) | 12 | 70 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.