Castine, ME ZIP codes
Castine, Maine has 2 ZIP codes, including 1 PO Box ZIP. They are in Hancock County.
- Population in these ZIPs
- 1,362
- Avg. median income
- $113,800population-weighted
- Typical home value
- $603,500population-weighted
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Castine, ME ZIP codes list
| ZIP code | County | Population | Median income | Typical home value |
|---|---|---|---|---|
| 04420 PO Box | Hancock County | — | — | — |
| 04421 | Hancock County | 1,362 | $113,750 | $603,500 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Castine
- Brooksville 5 mi
- Harborside 6 mi
- Penobscot 7 mi
- Stockton Springs 7 mi
- Searsport 7 mi
- Little Deer Isle 9 mi
- Islesboro 9 mi
- Sedgwick 10 mi
- Sargentville 10 mi
- Belfast 12 mi
- Deer Isle 12 mi
- East Orland 13 mi
Frequently asked questions
What county is Castine, Maine in?
Castine ZIP codes are in Hancock County.
Which Castine ZIP codes are PO Boxes?
04420 is a PO Box or single-organization ZIP code; it has no residential delivery area.