San Mar Flag

San Mar

County Seat:
No
Area (mi²):
0.466
State:
Maryland

San Mar is a CDP located in Washington County, Maryland. San Mar has a 2025 population of 345. San Mar is currently declining at a rate of -0.86% annually but its population has increased by 8.49% since the most recent census, which recorded a population of 318 in 2020.

The average household income in San Mar is $181,505 with a poverty rate of 20.81%.The median age in San Mar is 66.9 years: 62.7 years for males, and 79.1 years for females.

345
Total Population
740
Density (mi²)
-3 -0.86%
Growth

San Mar Population

San Mar Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of San Mar includes 93.76% White, 5.31% Black or African American, and smaller percentages for Two or more races and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White40693.76%
Black or African American235.31%
Two or more races40.92%

San Mar Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

San Mar's average per capita income is $37,176. Household income levels show a median of $88,056. The poverty rate stands at 20.81%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Families$108,906$116,276
Married Families$108,906-
Households$88,056$181,505
Non Families$55,313$209,621

$37,176

Average Income

$88,056

Median Household Income

20.81%

Poverty Rate

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)