ZIP code · Castine · Maine · United States
ZIP code 04421 — Castine
ZIP code 04421 serves Castine, Maine.
- Postal code
- 04421Single source Value from one source, not cross-checked.
- City
- Castine
- County
- Hancock FIPS 23009
- State
- Maine
- Country
- United States
- Coordinates
- 44.4156, -68.7929 — precision precise (locality)
View on OpenStreetMap - Population
- 1,222 (ZCTA, ACS 5-year)
- Population density
- 157 / sq mi
- Land area
- 7.8 sq mi (20.1 km²) (ZCTA, ACS 5-year)
- Median household income
- $111,500
- Per-capita income
- $33,888
- Median age
- 21
- Households
- 302
- Housing units
- 694
- Median home value
- $557,700
- Median gross rent
- $1,028 / month
- Congressional district
- ME-2 (119th Congress)
- USDA hardiness zone
- 5b (-15 to -10 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/New_York (UTC−5 / UTC−4 DST)
- Area code
- 207Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 04421 with another ZIP · ZIPs within 25 miles · distance from 04421
Map of ZIP code 04421
Climate — monthly normals
Warmest month Jul (avg high 77°F), coldest Jan (avg low 10°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 30 | 32 | 40 | 52 | 63 | 72 | 77 | 76 | 70 | 57 | 46 | 35 |
| Avg low °F | 10 | 12 | 20 | 31 | 41 | 51 | 57 | 56 | 48 | 38 | 29 | 18 |
| Precip in | 3.9 | 3.2 | 4.1 | 4.4 | 3.9 | 4.3 | 3.2 | 3.1 | 4.1 | 5.4 | 4.7 | 4.7 |
NOAA 1991–2020 climate normals from the nearest station: BELFAST (9.8 mi) · NOAA NCEI
Places in ZIP 04421
- 1 schools
- 1 colleges & universities
- 1 doctors & dentists
- 4 restaurants & cafés
- 1 bars & pubs
- 6 parks
- 1 playgrounds
- 3 gyms & sports centres
- 2 libraries
- 1 post offices
- 5 places of worship
- 1 gas stations
- 1 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page