County ZIP codes · Maine · FIPS 23027
Waldo County, ME ZIP Codes
Waldo County, Maine has 20 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 18 residential and 2 for PO boxes or a single organization. 1 of the residential ones extends into a neighboring county. Median household income ranges from $62,929 in 04988 (Unity) to $98,333 in 04496 (Winterport) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Waldo 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 $65,662 and $81,300.
They carry 18 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 18 residential ZIP codes in Waldo County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 04915 | Belfast | 9,107 | 125 | $66k | $309k | 100% |
| 04849 | Lincolnville | 4,017 | 66 | $80k | $361k | 100% |
| 04496 | Winterport | 3,850 | 108 | $98k | $283k | 100% |
| 04974 | Searsport | 2,655 | 93 | $64k | $224k | 100% |
| 04981 | Stockton Springs | 2,575 | 68 | $78k | $239k | 100% |
| 04986 | Thorndike | 2,228 | 41 | $72k | $185k | 100% |
| 04988 | Unity | 1,894 | 38 | $63k | $204k | 79% |
| 04952 | Morrill | 1,790 | 59 | $68k | $216k | 100% |
| 04921 | Brooks | 1,775 | 36 | $64k | $210k | 100% |
| 04973 | Searsmont | 1,646 | 44 | $87k | $284k | 100% |
| 04941 | Freedom | 1,577 | 25 | $66k | $214k | 100% |
| 04354 | Palermo | 1,473 | 36 | $89k | $260k | 100% |
| 04438 | Frankfort | 1,098 | 45 | $80k | $211k | 100% |
| 04951 | Monroe | 1,001 | 26 | $81k | $220k | 100% |
| 04987 | Troy | 984 | 28 | $45k | $213k | 100% |
| 04949 | Liberty | 969 | 37 | $71k | $230k | 100% |
| 04922 | Burnham | 953 | 25 | $59k | $178k | 100% |
| 04848 | Islesboro | 636 | 44 | $88k | $289k | 100% |
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 Waldo County extends into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Waldo | Elsewhere |
|---|---|---|
| 04988 | 79% | Kennebec County 21% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 04850 | Lincolnville Center |
| 04972 | Sandy Point |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Waldo County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Waldo County's ZIP codes use 4 prefixes: 043, 044, 048 and 049.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 043 | Southern, ME (SCF 040) | 1 | 26 |
| 044 | Eastern, ME (SCF 044) | 2 | 68 |
| 048 | Southern, ME (SCF 040) | 3 | 20 |
| 049 | Eastern, ME (SCF 044) | 14 | 70 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.