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 Moderate-density area
- $113,750
- Median income Above-median income area
- $603,500
- Median home value Above-median home value
- 74.5%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
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 average Maine ZIP), while per-capita income is $39,304. The poverty rate is 14.1%, with unemployment at 2.7%; those measures add context to the income figure. Housing is both higher-cost and owner-heavy: median home value is $603,500 (113% above the average Maine ZIP), while 80.4% of occupied homes are owner-occupied and median rent is $1,105.
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 -. The page also surfaces 8 ZIP codes within roughly 10 miles and 6 more in Hancock County, so 04421 can be compared with both its immediate and county-level context.
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.
- Accommodation and food services
Accommodation and food services
7 establishments
- Construction
Construction
4 establishments
- Retail trade
Retail trade
4 establishments
- Arts, entertainment, and recreation
Arts, entertainment, and recreation
4 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, 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
Who lives in ZIP 04421?
21.2
Median Age
62.2%
Male
37.8%
Female
6.1%
Foreign-Born
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 ZIP avg
$39,304
Per Capita Income
14.1%
Poverty Rate
2.7%
Unemployment Rate
How ZIP 04421 ranks among Maine ZIPs
Castine, ME household income vs. every Maine ZIP code
Median household income among 395 reporting Maine ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$113,750 Top 4% higher than 96% of 395 Maine ZIPs
Each bar is a $20K-wide band; taller bars hold more Maine 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?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
720housing units
720
Total Housing Units
352
Occupied Units
368
Vacant Units
2.22
Avg Household Size
Occupancy Type
$603,500
Median Home Value
+113% vs state ZIP avg
$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.
- 04974
Searsport (04974)
2,611 residents
- 04981
Stockton Springs (04981)
2,316 residents
- 04421
Castine (04421)
1,366 residents
- 04476
Penobscot (04476)
1,259 residents
- 04617 811
Brooksville (04617)
811 residents
- 04848 566
Islesboro (04848)
566 residents
- 04650 235
Little Deer Isle (04650)
235 residents
- 04642 123
Harborside (04642)
123 residents
- 04673 112
Sargentville (04673)
112 residents
What this shows Among its immediate neighbors, ZIP 04421 ranks #3 by population - useful context the national average alone can't give.
ZIP 04421 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 04421
Castine (04421)
$113,750 median income
- 04650
Little Deer Isle (04650)
$110,063 median income
- 04848
Islesboro (04848)
$88,438 median income
- 04981
Stockton Springs (04981)
$77,560 median income
- 04642
Harborside (04642)
$71,563 median income
- 04974
Searsport (04974)
$64,303 median income
- 04476
Penobscot (04476)
$63,194 median income
- 04673
Sargentville (04673)
$53,750 median income
- 04617
Brooksville (04617)
$52,078 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.
| 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 |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 04421, both outside ME so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (1,366 here; floor ≥1,000).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Hancock County
Related Areas
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.
Related
Take this with you
What to do with ZIP 04421's numbers, next.
- See how ZIP 04421 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Castine, ME ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
- Save this ZIP to your shortlist to track alongside others you're considering View your shortlist
ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.