Black Diamond Flag

Black Diamond

County:
King County
County Seat:
No
Area (mi²):
6.598
State:
Washington

Black Diamond is a city located in King County, Washington. Black Diamond has a 2025 population of 7,772. Black Diamond is currently growing at a rate of 8.14% annually and its population has increased by 60.38% since the most recent census, which recorded a population of 4,846 in 2020.

The average household income in Black Diamond is $172,884 with a poverty rate of 1.14%.The median age in Black Diamond is 38.1 years: 39.9 years for males, and 36.6 years for females.

7.8K
Total Population
1,178
Density (mi²)
585 8.14%
Growth

Black Diamond Population

Black Diamond Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Black Diamond includes 74.66% White, 11.39% Asian, and smaller percentages for other race, Black or African American and multiracial populations.

Population by Race

White (74.7%)

Asian (11.4%)

Two or more races (10.9%)

Other race (2.7%)

Black or African American (0.4%)

Race
Population
Percentage (of total)
White4,23974.66%
Asian64711.39%
Two or more races62010.92%
Other race1512.66%
Black or African American210.37%

Black Diamond Marital Status

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

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Black Diamond's average per capita income is $86,221. Household income levels show a median of $144,728. The poverty rate stands at 1.14%.

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
Married Families$165,855-
Families$155,000$184,640
Households$144,728$172,884
Non Families$86,050$130,828

$86,221

Average Income

$144,728

Median Household Income

1.14%

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)