PlainZIP

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
$60,341
Median income
$188,200
Median home value
11.0%
Bachelor's or higher

The verdict

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 Maryland average), while per-capita income is $30,716. 19.2% of residents live below the poverty line, and the unemployment rate reads 4.0%. Median home value sits at $188,200 (58% below the state average), median rent at $1,615 a month, and owner-occupancy at 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 -. To put 21821 in local context, 6 ZIP codes within roughly 10 miles appear further down this page alongside 6 additional ZIPs in Somerset County, for a geography-aware comparison.

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

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 21821?

46.0

Median Age

44.5%

Male

55.5%

Female

7.4%

Foreign-Born

White 93.5%
African American 0.0%
Asian 0.0%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 6.5%
Hispanic or Latino 6.0%

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?

$60,341

Median Household Income

-47% vs state

$30,716

Per Capita Income

19.2%

Poverty Rate

4.0%

Unemployment Rate

How ZIP 21821 ranks nationally

Deal Island, MD household income vs. every US ZIP code

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

$60,341 30th percentile higher than 30% 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%). This entry sits in this band. $80,000–$100,000: 5,778 US ZIPs (19%). Above this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $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 47.8%
Bachelor's Degree or Higher 11.0%

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

What does housing look like?

679

Total Housing Units

375

Occupied Units

304

Vacant Units

2.13

Avg Household Size

Occupancy Type

Owner 83.2%
Renter 16.8%

$188,200

Median Home Value

-58% vs state

$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.

residents

What this shows Among its immediate neighbors, ZIP 21821 ranks the most populous - useful context the national average alone can't give.

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

ZIP 21821 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 21821 ranks #4 of 4 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
21840 Nanticoke, MD 375 6.5 mi
21814 Bivalve, MD 380 8.9 mi
21867 Upper Fairmount, MD 114 7.9 mi
21627 Crocheron, MD 18 8.3 mi
21865 Tyaskin, MD 470 9.2 mi
21672 Toddville, MD 241 10.8 mi

More ZIP Codes in Somerset County

21853 standard
Princess Anne, MD
Pop: 11,126
21817 standard
Crisfield, MD
Pop: 5,236
21890 standard
Westover, MD
Pop: 3,240
21871 standard
Westover, MD
Pop: 2,124
21838 standard
Marion Station, MD
Pop: 1,736
21824 standard
Ewell, MD
Pop: 198

Related Areas

Somerset County Deal Island, MD Maryland

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.

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