Cobb Island, MD Profile: Facts & Data


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Cobb Island, Maryland - Basic Facts

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The Cobb Island CDP(1) had a population of 1,239 as of July 1, 2021.

The primary coordinate point for Cobb Island is located at latitude 38.2585 and longitude -76.8439 in Charles County. The formal boundaries for the Cobb Island Census Designated Place encompass a land area of 0.62 sq. miles and a water area of 0.3 sq. miles. Charles County is in the Eastern time zone (GMT -5). The elevation is 0 feet.

The Cobb Island Census Designated Place has a U1 Census Class Code which indicates a census designated place with an official federally recognized name. It also has a Functional Status Code of "S" which identifies a statistical entity.

The Cobb Island Census Designated Place is located within District 5, Thompkinsville, a minor civil division (MCD) of Charles County.

  1. A Census Designated Place (CDP) is a statistical counterpart to a self-governing (incorporated) place such as a city, town, or village. A CDP is not a legal entity and has no governmental functions.

Jump to... (On This Page!)
  1. Cobb Island 2021 Demographic Data
  2. Growth Rates for Cobb Island (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Maryland Research Tools (Easy Tools & Current Data)
  3. Maryland Data Comparison Tool - 2021 Demographics

Cobb Island, MD Data & Demographics (As of July 1, 2021)


Total Population 1,239 (100%)
Population in Households 1,239 (100.0%)
Population in Families 973 (78.5%)
Population in Group Quarters1 0
Population Density 1,980
Diversity Index2 30


Median Household Income $67,255
Average Household Income $82,509
% of Income for Mortgage4 21%
Per Capita Income $35,121
Wealth Index5 93


Total HU (Housing Units) 725 (100%)
Owner Occupied HU 451 (62.2%)
Renter Occupied HU 87 (12.0%)
Vacant Housing Units 187 (25.8%)
Median Home Value $342,972
Average Home Value $350,778
Housing Affordability Index3 113


Total Households 538
Average Household Size 2.3
Family Households 339
Average Family Size 3
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. 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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2021 2021-2026
Population 0.54% 0.72%
Households 0.69% 0.84%
Families 0.65% 0.64%
Median Household Income   2.75%
Per Capita Income   2.41%
Owner Occupied HU   1.04%

Cobb Island, MD - Peer Comparisons by Rank and Percentile

The table below compares Cobb Island to the other 518 incorporated cities, towns and CDPs in Maryland by rank and percentile using July 1, 2021 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 # 302 42nd
Population Density # 192 63rd
Median Household Income # 357 31st
Housing Affordability Index # 108 21st
Per Capita Income # 299 42nd
Diversity Index # 344 34th

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

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