Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/ME/CASTINE

Castine ZIP codes, Maine

Castine, ME has 2 ZIP codes (04421 and 04420) and area code 207. The largest is 04421.

USPS city name
2 ZIP codes
Population
996
Area code
207
State
Maine

Castine in numbers

About 996 people live in Castine, in 183 households. The median household income is $168,516 a year, 2.3 times the Maine median of $74,733 (US: $80,734). The median owner-occupied home is valued at $798,800 (2.7 times the Maine median). The median age is 20.4; 88.1% of adults 25 and over hold a bachelor's degree or higher (36.2% across Maine); the average commute takes 14 minutes.

Population996Castine996
Households183Castine183
Median age20.4Castine20.4Maine44.8US 38.9
Median household income$168,516Castine$168,516Maine$74,733US $80,734
Median home value$798,800Castine$798,800Maine$296,600US $332,700
Bachelor's degree or higher88.1%Castine88.1%Maine36.2%US 35.7%
Mean commute14.1 minCastine14.1 minMaine24.6 minUS 26.4 min
Population density646 / sq miCastine646 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Castine CDP. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Castine

ZIP codes with the USPS city name Castine
ZIP City Type Population Median income Median home
04421 Castine , ME Standard 1,362 $113,750 $603,500
04420 Castine , ME No street area — — —

Map of Castine ZIP codes

0442104420

The ZIP codes of Castine, ME, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Castine

The nearest larger towns are Searsport (1,218 people, 7.8 mi), Belfast (6,986 people, 11 mi) and Bucksport (3,105 people, 13 mi).

Towns near Castine
TownPopulationDistance
Belfast 6,986 11.1 mi
Bucksport 3,105 13.4 mi
Camden 3,682 18.0 mi
Ellsworth 8,657 20.7 mi
Hampden 5,161 24.5 mi
Rockland 7,035 24.6 mi
Brewer 9,652 27.2 mi

More nearby: every ZIP code in Hancock County · Maine ZIP codes

Cite this page

zipcodes.pro. “Castine, ME ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/me/castine

Underlying data is public domain or openly licensed — sources, vintages and licences.