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About Black Diamond, Washington

Black Diamond is a city in King County, Washington, United States. The population was 4,151 at the 2010 census.Based on per capita income, one of the more reliable measures of affluence, Black Diamond ranks 64th of 522 areas in the state of Washington to be ranked.

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Black Diamond Facts

  • Population Total: 4,151
  • Square Miles: 5.4
  • Area Code: 360
  • Elevation: 653
  • Postal Codes: 98010
  • Timezone: Pacific