Cobb Island, MD 20625 ZIP Code Profile

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Cobb Island, MD

ZIP Code 20625: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Cobb Island, MD 20625

  • ZIP Code Type: PO BOX
  • County: Charles County
  • Centroid: Latitude 38.26, Longitude -76.844
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes
  • Businesses Addresses: 3
  • PO Box Addresses: 337
  • Residential Addresses: 1
    • Multi-Family Addresses: 0
    • Single Family Addresses: 1

The ZIP Code maps and database are updated 4 times per year.
Database updated: May 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.


20625 ZIP Code Map

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Cobb Island, MD 20625 Data & Demographics (As of July 1, 2017)


Total Population 1,121
Daytime Population: Workers 106
Daytime Population: Residents 752
Total Daytime Population (TDP) 858
Ratio TDP/Total Population1 0.77
Population in Households 1,121
Population in Familes 877
Population in Group Qrtrs 0
Population Density2 2,232
Diversity Index3 23


Median Household Income $64,654
Average Household Income $89,855
Per Capita Income $38,234


Total Housing Units 650 (100%)
Owner Occupied HU 387 (59.5%)
Renter Occupied HU 90 (13.8%)
Vacant Housing Units 173 (26.6%)
Median Home Value $247,727
Average Home Value $335,788


Total Households 477
Average Household Size 2.35
Family Households 299
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 0.75% 0.98%
Households 0.78% 0.99%
Families 0.62% 0.85%
Median Household Income   2.27%
Per Capita Income   3.04%

Cobb Island, MD 20625 - Peer Comparisons by Rank and Percentile

The table below compares 20625 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 # 344 25th
Population Density # 105 77th
Diversity Index # 356 22nd
Median Household Income # 290 37th
Per Capita Income # 201 56th

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

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