ZIP code 04421: Castine, ME
04421 is a ZIP code in Castine, Maine, mainly in Hancock County. About 1,362 people live here.
- Population
- 1,362
- Median household income
- $113,750
- Typical home value
- $603,500ACS median value
- Median rent
- $1,105gross, per month
- Median age
- 21.2
- Homeowners
- 80.4%of occupied homes
Shaded: ZIP code 04421's area. Click anywhere on the map to see which ZIP code it's in.
ZIP codes within 10 milesWithin 25 miles
ZIP code 04421 details
| City | Castine |
|---|---|
| State | Maine |
| County | Hancock County |
| Metro area | Not in a metro or micro area |
| Time zone | Eastern Time (UTC−5), observes daylight saving time |
| Type | Standard (delivery area) |
| Land area | 7.8 sq mi, plus 12.2 sq mi of water |
| Population density | 175 people per sq mi |
| Bachelor's degree or higher | 74.5% of adults 25+ |
| Average commute | 14.2 minutes |
| Center coordinates | 44.40901, -68.81553 |
ZIP codes near 04421
| ZIP code | City | Distance | Population |
|---|---|---|---|
| 04420 | Castine, ME | 0.9 mi | — |
| 04617 | Brooksville, ME | 5.3 mi | 651 |
| 04642 | Harborside, ME | 5.4 mi | 202 |
| 04974 | Searsport, ME | 7.0 mi | 2,655 |
| 04972 | Sandy Point, ME | 7.3 mi | — |
| 04981 | Stockton Springs, ME | 7.3 mi | 2,575 |
| 04476 | Penobscot, ME | 7.4 mi | 1,154 |
| 04848 | Islesboro, ME | 9.1 mi | 636 |
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
Buying a home in 04421?
A typical home in ZIP code 04421 is worth about $603,500 (ACS median value). The median household here earns $113,750 a year. See what buying here would cost per month, with Maine average taxes and insurance filled in.
Monthly payment for a $603,500 homeWhat can a $113,750 income afford?Rental property numbers
About ZIP code 04421
What city is ZIP code 04421?
ZIP code 04421 is in Castine, ME, in Hancock County.
What county is ZIP code 04421 in?
04421 is mainly in Hancock County, Maine.
What is the population of ZIP code 04421?
About 1,362 people live in ZIP code 04421, according to the American Community Survey 2020–2024 5-year estimates.
What time zone is ZIP code 04421 in?
04421 is in Eastern Time (UTC−5). It observes daylight saving time.
What other ZIP codes does Castine have?
Castine, ME also uses 04420.