ZIP codes in Waldo County
20 ZIPs touch Waldo County, Maine. The blue dashed line is the county border; orange ZIPs reach into it.
20
ZIP codes
1
cross the county line
40,228
people in these ZIPs
16
counties in ME
Most people
Waldo County ZIP list
More counties in Maine
- Lincoln County28
- Oxford County36
- Penobscot County49
- Piscataquis County16
- Sagadahoc County9
- Somerset County26
- Washington County32
- York County42
Questions people actually ask
How many ZIP codes are in Waldo County, Maine?
20 ZIP codes reach into Waldo County, including 2 PO Box or single-address ZIPs placed by the town they serve. 1 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Waldo County has the most people?
04915 (Belfast) has about 9,107 residents, the most of any ZIP touching Waldo County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Waldo County and another county?
Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Waldo County. For one address, pin the exact spot on the ZIP finder to see its county.
Where does this list come from?
ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.
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Updated 2026-11-10 · Where the data comes from