ZIP Code Tabulation Area · Maine

ZIP Code 04421: Castine, ME

ZIP Code 04421 (Castine, Hancock County, Maine) has an estimated 1,362 residents in 352 households. The median household income is $113,750, the median home value is $603,500 and the median gross rent is $1,105/mo. Figures are U.S. Census Bureau American Community Survey 2020–2024 5-year estimates for the matching ZIP Code Tabulation Area.

American Community Survey 2020–2024 5-year estimates · Updated

Some estimates have a large margin of error. One figure for this ZIP (work from home) is marked with *. ACS figures come from a sample, and small areas have fewer responses, so treat these numbers as rough ranges.

Total population

1,362

Margin of error ±167

Median household income

$113,750

Margin of error ±$26,100

Median home value

$603,500

Margin of error ±$114,039

Median gross rent

$1,105/mo

Margin of error ±$104

Median age

21.2 yrs

Margin of error ±0.7 yrs

Mean travel time to work

14.2 min

Margin of error ±6.1 min

How ZIP 04421 compares with Maine and the U.S.

State and national figures are the Census Bureau's own estimates for those areas from the same ACS release, not averages of ZIP codes.

Median age

ZIP 0442121.2 yrsMaine44.8 yrsUnited States38.9 yrs

Median household income

ZIP 04421$113,750Maine$74,733United States$80,734

Per capita income

ZIP 04421$39,304Maine$43,742United States$44,673

Poverty rate

ZIP 0442114.1%Maine10.7%United States12.5%

Unemployment rate

ZIP 044212.7%Maine3.8%United States5.2%

Bachelor's degree or higher

ZIP 0442174.5%Maine36.2%United States35.7%

Median home value

ZIP 04421$603,500Maine$296,600United States$332,700

Median gross rent

ZIP 04421$1,105/moMaine$1,139/moUnited States$1,413/mo

Owner-occupied homes

ZIP 0442180.4%Maine74.3%United States65.2%

Mean travel time to work

ZIP 0442114.2 minMaine24.6 minUnited States26.4 min

Worked from home

ZIP 0442111.7%*Maine15.9%United States15.1%

All figures for ZIP 04421

Each estimate has a 90% margin of error: the true value is likely within that range. * marks estimates with a large margin of error (a coefficient of variation above 30%, or ±10 percentage points or more for rates).

ZIP 04421 — ACS 2020–2024 5-year estimates
MeasureZIP 04421Margin of errorMaineUnited States
Total population1,362±1671,387,817334,922,499
Median age21.2 yrs±0.7 yrs44.8 yrs38.9 yrs
Households352±71597,159129,227,496
Median household income$113,750±$26,100$74,733$80,734
Per capita income$39,304±$6,839$43,742$44,673
Poverty rate14.1%±9.2 pts10.7%12.5%
Unemployment rate2.7%±4.2 pts3.8%5.2%
Bachelor's degree or higher74.5%±4.9 pts36.2%35.7%
Median home value$603,500±$114,039$296,600$332,700
Median gross rent$1,105/mo±$104$1,139/mo$1,413/mo
Owner-occupied homes80.4%±6.1 pts74.3%65.2%
Mean travel time to work14.2 min±6.1 min24.6 min26.4 min
Worked from home11.7%*±10.6 pts15.9%15.1%

Race and Hispanic or Latino origin

Shares of the total population by the Census Bureau's race and Hispanic or Latino origin categories (table B03002), listed in the Census Bureau's order. People self-identify on the survey.

Population by race and Hispanic or Latino origin, ZIP 04421
GroupZIP 04421MaineUnited States
White alone, not Hispanic or Latino84.4%89.9%57.4%
Black or African American alone, not Hispanic or Latino3.7%1.8%11.9%
American Indian and Alaska Native alone, not Hispanic or Latino0.0%0.3%0.5%
Asian alone, not Hispanic or Latino0.0%1.1%5.9%
Native Hawaiian and Other Pacific Islander alone, not Hispanic or Latino0.0%0.0%0.2%
Some other race alone, not Hispanic or Latino0.0%0.4%0.6%
Two or more races, not Hispanic or Latino6.9%4.2%4.3%
Hispanic or Latino (of any race)5.0%2.2%19.3%

Where ZIP 04421 is

State
Maine
Main county
Hancock County
Largest overlapping place
Castine (20% of the ZIP's land area)
Land area
7.78 sq mi· about 175 people per sq mi

County and place names come from the Census Bureau's 2020 ZCTA relationship files. A ZIP code's mailing city, set by the U.S. Postal Service, can differ from these names.

Other ZIP codes in Hancock County

04408 Hancock County, ME04416 Bucksport, ME04429 Hancock County, ME04431 Hancock County, ME04472 Hancock County, ME04476 Hancock County, ME04605 Ellsworth, ME04607 Hancock County, ME04609 Hancock County, ME04612 Hancock County, ME04613 Hancock County, ME04614 Hancock County, ME04616 Hancock County, ME04617 Hancock County, ME04624 Hancock County, ME04625 Hancock County, ME04627 Hancock County, ME04634 Hancock County, ME04635 Hancock County, ME04640 Hancock County, ME04642 Hancock County, ME04646 Hancock County, ME04650 Hancock County, ME04653 Hancock County, ME

See every ZIP code in Maine, or compare ZIP 04421 with another ZIP code.

Census figures describe residents as a group and cannot tell you about any one home or street. For a specific address, check local government and housing records.

About ZIP codes and ZCTAs: the Census Bureau publishes statistics for ZIP Code Tabulation Areas, which approximate USPS ZIP code delivery areas. Learn how they differ.

Sources

  • U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, detailed tables B01003, B01002, B11001, B19013, B19301, B17001, B23025, B15003, B25077, B25064, B25003, B08013, B08303, B08301, B03002 — snapshot Oct 26, 2026.
  • U.S. Census Bureau, 2020 ZCTA5 relationship files (county and place).
  • Data: U.S. Census Bureau, American Community Survey 5-year estimates (detailed tables) and 2020 Census ZCTA relationship files. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau. These agencies do not endorse OpenZIP.