PlainZIP

Castine, ME · standard

ZIP Code 04421

Hancock County, Maine - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

1,366
68/sq mi
$113,750
Median income
$603,500
Median home value
74.5%
Bachelor's or higher

The verdict

Castine pairs an upper-quartile household income with top-decile home values, in a rural, homeowner-dominated area.

Top 12%
household income, US ZIPs
Top 9%
home value, US ZIPs
68
people per sq mi
80%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 04421 against every reporting US ZIP.

ZIP code 04421 is a sparsely populated ZIP (a standard USPS delivery area) in Castine, Hancock County, Maine, home to just 1,366 residents across 20.1 square miles, a density of 68 people per square mile, in the New York time zone.

ZIP 04421 skews affluent, with a median household income of $113,750 (55% above the Maine average), while per-capita income is $39,304. Local economic indicators show a 14.1% poverty rate alongside 2.7% unemployment. Median home value sits at $603,500 (113% above the state average), median rent at $1,105 a month, and owner-occupancy at 80.4%.

This is a highly-educated ZIP: 74.5% of adults hold a bachelor's degree or higher, the median age is 21.2, and the average commute is -. A geography-based comparison follows: 8 ZIP codes within about 10 miles of 04421, plus 6 more within Hancock County, give a clearer read than the national average alone.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 04421

Top 5 sectors by establishment count in Castine, ME

Which industries have the most business establishments in ZIP 04421.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 04421, Castine, ME · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

1,366

Population

20.1

Area (sq mi)

68

People / sq mi

New York

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 04421?

21.2

Median Age

62.2%

Male

37.8%

Female

6.1%

Foreign-Born

White 86.0%
African American 3.7%
Asian 0.0%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 9.2%
Hispanic or Latino 5.0%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$113,750

Median Household Income

+55% vs state

$39,304

Per Capita Income

14.1%

Poverty Rate

2.7%

Unemployment Rate

How ZIP 04421 ranks nationally

Castine, ME household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$113,750 Top 12% higher than 88% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Below this entry. $100,000–$120,000: 2,855 US ZIPs (9%). This entry sits in this band. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 82.6%
Bachelor's Degree or Higher 74.5%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

720

Total Housing Units

352

Occupied Units

368

Vacant Units

2.22

Avg Household Size

Occupancy Type

Owner 80.4%
Renter 19.6%

$603,500

Median Home Value

+113% vs state

$1,105

Median Rent

1974

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What businesses operate in this ZIP?

Census Bureau data shows 28 business establishments in ZIP 04421, employing approximately 150 people with a combined annual payroll of $6,363,000.

28

Businesses

150

Employees

$6.4M

Annual Payroll

4

Industry Sectors

Industry Establishments % of Total
Accommodation and food services 7 25.0%
Construction 4 14.3%
Retail trade 4 14.3%
Arts, entertainment, and recreation 4 14.3%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 04421 vs 04642 →

ZIP 04421 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 04421 ranks #3 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 04421 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 04421 ranks the highest of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
04642 Harborside, ME 123 5.4 mi
04617 Brooksville, ME 811 4.2 mi
04476 Penobscot, ME 1,259 6.2 mi
04981 Stockton Springs, ME 2,316 8.9 mi
04650 Little Deer Isle, ME 235 9.7 mi
04974 Searsport, ME 2,611 8.6 mi
04848 Islesboro, ME 566 8.9 mi
04673 Sargentville, ME 112 9.2 mi

More ZIP Codes in Hancock County

04605 standard
Ellsworth, ME
Pop: 12,974
04416 standard
Bucksport, ME
Pop: 5,468
04609 standard
Bar Harbor, ME
Pop: 5,222
04614 standard
Blue Hill, ME
Pop: 2,579
04640 standard
Hancock, ME
Pop: 2,261
04472 standard
Orland, ME
Pop: 2,144

Related Areas

Hancock County Castine, ME Maine

Frequently Asked Questions

What county is ZIP code 04421 in? ▼
ZIP code 04421 (Castine) is located in Hancock County, Maine. Hancock County contains multiple ZIP codes, see the full list at /counties/hancock-me.
What is the population of ZIP code 04421? ▼
ZIP code 04421 in Castine, ME has a population of 1,366 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 04421? ▼
The median household income in ZIP 04421 is $113,750, which is 49% above the national average of $76,288.
What is the average home value in ZIP 04421? ▼
The median home value in ZIP 04421 is $603,500, which is 117% above the national average of $278,155.
What is the demographic makeup of ZIP 04421? ▼
The largest racial group in ZIP 04421 is White at 86.0%. Hispanic or Latino residents make up 5.0% of the population.
How many businesses are in ZIP code 04421? ▼
ZIP code 04421 has 28 business establishments employing approximately 150 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 04421? ▼
The top industries by establishment count in ZIP 04421 are: Accommodation and food services (7), Construction (4), Retail trade (4). There are 4 industry sectors represented in total.
What is the education level in ZIP code 04421? ▼
In ZIP code 04421, 82.6% of residents aged 25+ have a high school diploma or higher, and 74.5% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 04421? ▼
In ZIP code 04421, approximately 80.4% of occupied housing units are owner-occupied and 19.6% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 04421? ▼
The poverty rate in ZIP code 04421 is 14.1% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.