Deal Island, MD · standard
ZIP Code 21821
Somerset County, Maryland - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 991
- 35/sq mi Moderate-density area
- $60,341
- Median income Below-median income area
- $188,200
- Median home value Near-median home value
- 11.0%
- Bachelor's or higher Below-average bachelor's attainment
National ZIP placement
Deal Island pairs a below-median household income with below-median home values, in a rural, homeowner-dominated area.
- 30th pct
- household income, US ZIPs
- 40th pct
- home value, US ZIPs
- 35
- people per sq mi
- 83%
- owner-occupied homes
Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 21821 against every reporting US ZIP.
ZIP code 21821 is a sparsely populated ZIP (a standard USPS delivery area) in Deal Island, Somerset County, Maryland, home to just 991 residents across 28.3 square miles, a density of 35 people per square mile, in the New York time zone.
ZIP 21821 reports a modest median household income of $60,341 (47% below the average Maryland ZIP), while per-capita income is $30,716. The poverty rate is 19.2%, with unemployment at 4.0%; those measures add context to the income figure. Home values sit below the statewide ZIP benchmark: the median is $188,200 (58% below the average Maryland ZIP), and median rent is $1,615; owner occupancy is 83.2%.
Formal educational attainment runs low here: just 11.0% of adults hold a bachelor's degree or higher, the median age is 46, and the average commute is -. The page also surfaces 6 ZIP codes within roughly 10 miles and 6 more in Somerset County, so 21821 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 →
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 21821, Deal Island, MD · 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
991
Population
28.3
Area (sq mi)
35
People / sq mi
New York
Time Zone
standard
ZIP Type
Who lives in ZIP 21821?
46.0
Median Age
44.5%
Male
55.5%
Female
7.4%
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?
$60,341
Median Household Income
-47% vs state ZIP avg
$30,716
Per Capita Income
19.2%
Poverty Rate
4.0%
Unemployment Rate
How ZIP 21821 ranks among Maryland ZIPs
Deal Island, MD household income vs. every Maryland ZIP code
Median household income among 419 reporting Maryland ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$60,341 7th percentile higher than 7% of 419 Maryland ZIPs
Each bar is a $20K-wide band; taller bars hold more Maryland 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
679housing units
679
Total Housing Units
375
Occupied Units
304
Vacant Units
2.13
Avg Household Size
Occupancy Type
$188,200
Median Home Value
-58% vs state ZIP avg
$1,615
Median Rent
1969
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What businesses operate in this ZIP?
Census Bureau data shows 7 business establishments in ZIP 21821, employing approximately 70 people with a combined annual payroll of $6,111,000.
7
Businesses
70
Employees
$6.1M
Annual Payroll
0
Industry Sectors
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 21821 vs 21840 →
ZIP 21821 vs its nearest neighbors, by population
Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 21821
Deal Island (21821)
991 residents
- 21865
Tyaskin (21865)
470 residents
- 21814 380
Bivalve (21814)
380 residents
- 21840 375
Nanticoke (21840)
375 residents
- 21672 241
Toddville (21672)
241 residents
- 21867 114
Upper Fairmount (21867)
114 residents
- 21627 18
Crocheron (21627)
18 residents
What this shows Among its immediate neighbors, ZIP 21821 ranks the most populous - useful context the national average alone can't give.
ZIP 21821 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 21627
Crocheron (21627)
$96,250 median income
- 21672
Toddville (21672)
$83,269 median income
- 21865
Tyaskin (21865)
$83,155 median income
- 21821
Deal Island (21821)
$60,341 median income
What this shows By household income, ZIP 21821 ranks #4 of 4 neighboring ZIPs, local affluence varies block to block, not just metro to metro.
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 21821, both outside MD so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Somerset County
Related Areas
Frequently Asked Questions
What county is ZIP code 21821 in?
ZIP code 21821 (Deal Island) is located in Somerset County, Maryland. Somerset County contains multiple ZIP codes, see the full list at /counties/somerset-md.
What is the population of ZIP code 21821?
ZIP code 21821 in Deal Island, MD has a population of 991 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 21821?
The median household income in ZIP 21821 is $60,341, which is 21% below the national average of $76,288.
What is the average home value in ZIP 21821?
The median home value in ZIP 21821 is $188,200, which is 32% below the national average of $278,155.
What is the demographic makeup of ZIP 21821?
The largest racial group in ZIP 21821 is White at 93.5%. Hispanic or Latino residents make up 6.0% of the population.
How many businesses are in ZIP code 21821?
ZIP code 21821 has 7 business establishments employing approximately 70 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What is the education level in ZIP code 21821?
In ZIP code 21821, 47.8% of residents aged 25+ have a high school diploma or higher, and 11.0% 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 21821?
In ZIP code 21821, approximately 83.2% of occupied housing units are owner-occupied and 16.8% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 21821?
The poverty rate in ZIP code 21821 is 19.2% 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 21821's numbers, next.
- See how ZIP 21821 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Deal Island, MD 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.