Deal Island, MD 21821 ZIP Code Profile

Related Place Profiles:
Chance, MD | Dames Quarter, MD | Deal Island, MD | Wenona, MD

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ZIP Code 21821: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Deal Island, MD 21821

Acceptable Alternative
Chance, MD 21821
Dames Quarter, MD 21821
Wenona, MD 21821

  • ZIP Code Type: STANDARD
  • County: Somerset County
  • Centroid: Latitude 38.167, Longitude -75.906
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes
  • Businesses Addresses: 21
  • PO Box Addresses: 81
  • Residential Addresses: 500
    • Multi-Family Addresses: 0
    • Single Family Addresses: 500

The ZIP Code maps and database are updated 4 times per year.
Database updated: February 1, 2018, Maps updated: February 1, 2018.

EXTREMELY LOCAL Demographic Data

Address Based Hyperlocal Data Input an address and get data & demographics for the pertinent census block group (CBG), a searchable map and a customized directory. The CBG is the smallest geographical unit used by the Census Bureau for reporting demographic data.


21821 ZIP Code Map

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Deal Island, MD 21821 Data & Demographics (As of July 1, 2017)


Total Population 942
Daytime Population: Workers 111
Daytime Population: Residents 581
Total Daytime Population (TDP) 692
Ratio TDP/Total Population1 0.73
Population in Households 942
Population in Familes 752
Population in Group Qrtrs 0
Population Density2 53
Diversity Index3 26


Median Household Income $36,219
Average Household Income $44,969
Per Capita Income $19,859


Total Housing Units 734 (100%)
Owner Occupied HU 347 (47.3%)
Renter Occupied HU 69 ( 9.4%)
Vacant Housing Units 318 (43.3%)
Median Home Value $125,000
Average Home Value $174,135


Total Households 416
Average Household Size 2.26
Family Households 275
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population -0.7% -0.54%
Households -0.55% -0.53%
Families -0.68% -0.66%
Median Household Income   0.3%
Per Capita Income   2.18%

Deal Island, MD 21821 - Peer Comparisons by Rank and Percentile

The table below compares 21821 to the other 456 ZIP Codes in Maryland by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 357 22nd
Population Density # 408 11th
Diversity Index # 333 27th
Median Household Income # 445 3rd
Per Capita Income # 439 4th

Additional comparisons and rankings can be made with a VERY EASY TO USE Maryland Census Data Comparison Tool.

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