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Where 04421 is
Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.
- 🔢 Type 04421 into a pocket calculator and turn it upside down: IZhhO — not quite a word, sorry.
- ➕ 04421 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 11, a total 714 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1000101000101 - 🏠 Its numerical neighbours: 04420 (Castine, ME, 1 mi away) and 04422 (Charleston, ME, 47 mi away).
- 🔄 Backwards, 04421 becomes 12440 — and that is a real ZIP code: High Falls, NY, 326 miles away.
- 👥 36 other ZIP codes are made of exactly the same digits (01244, 02144, 04124, 04241, 04412, 12404, …). The farthest-flung twin is 42041 in Fulton, KY, 1,182 miles away.
- 🧭 Farther north than 89% of all ZIP codes, and farther east than 97%.
- 🎯1,549 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 04421 and you would come out at 44.41°S, 111.18°E — 897 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 15h 32m of daylight. Shortest: 8h 50m.
- 📏 At 7.8 square miles of land, 04421 is bigger than 24% of ZIP codes — room for about 5.9 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 1,362This ZIP1,362 |
|---|---|
| Households | 352This ZIP352 |
| Housing units | 720This ZIP720 |
| Median age | 21.2This ZIP21.2Maine44.8US 38.9 |
| Median household income | $113,750This ZIP$113,750Maine$74,733US $80,734 |
| Median home value | $603,500This ZIP$603,500Maine$296,600US $332,700 |
| Median gross rent | $1,105This ZIP$1,105Maine$1,139US $1,413 |
| Bachelor's degree or higher | 74.5%This ZIP74.5% |
| Mean commute | 14.2 minThis ZIP14.2 min |
| Population density | 175.2 / sq miThis ZIP175.2 / sq mi |
Business and tax activity
| Business establishments | 28This ZIP28 |
|---|---|
| Employees | 150This ZIP150 |
| Annual payroll | $6,363,000This ZIP$6,363,000 |
| Tax returns filed | 350This ZIP350 |
| Total adjusted gross income | $43,638,000This ZIP$43,638,000 |
Land area
| Land area | 7.78 sq miThis ZIP7.78 sq mi |
|---|---|
| Water area | 12.23 sq miThis ZIP12.23 sq mi |
Other place names in 04421
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 04421
| ZIP | City | Distance |
|---|---|---|
04420 | Castine, ME | 0.9 mi |
04617 | Brooksville, ME | 5.3 mi |
04642 | Harborside, ME | 5.4 mi |
04974 | Searsport, ME | 7.0 mi |
04972 | Sandy Point, ME | 7.3 mi |
04981 | Stockton Springs, ME | 7.3 mi |
04476 | Penobscot, ME | 7.4 mi |
04848 | Islesboro, ME | 9.1 mi |
04650 | Little Deer Isle, ME | 9.2 mi |
04676 | Sedgwick, ME | 9.9 mi |
Find every ZIP code within 10 miles of 04421 →
Questions about this ZIP code
Where is ZIP code 04421?
04421 is in Castine, Maine, in Hancock County. Its published point location is 44.4090, -68.8155.
What county is 04421 in?
04421 lies in Hancock County.
What area code is 04421?
Castine uses area code 207, from NANPA's telephone records.
What time zone is 04421 in?
04421 uses America/New_York.
How many people live in 04421?
About 1,362 people live in ZIP code 04421, in 352 households, at 175.2 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What is the median household income in 04421?
$113,750 a year, against $74,733 across Maine.
What ZIP codes are near 04421?
The closest are 04420 (0.9 mi), 04617 (5.3 mi), 04642 (5.4 mi), 04974 (7 mi) and 04972 (7.3 mi).
Is 04421 a PO Box ZIP code?
04421 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “04421 ZIP Code — Castine, Maine (Hancock County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/04421
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/04421.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.