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 2026 population of 6,787. Black Diamond is currently growing at a rate of 4.59% annually and its population has increased by 40.05% since the most recent census, which recorded a population of 4,846 in 2020.

6.8K
Total Population
1,029
Density (mi²)
298 4.59%
Growth

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)