Black Diamond, Washington

Black Diamond population, 2020 to 2024

Black Diamond added 1,941 residents from July 2020 to July 2024, a change of +40.1%. In the latest year it moved by +298. Among 125 Washington places of 5,000 or more, that growth ranks 2nd; the median place changed by +2.6%. The median place of 5,000+ in Washington has 18,148 people, so Black Diamond is 37% of it.

Black Diamond covers 6.60 square miles of land and 0.60 of water, for 1,028 people per square mile of land. The median Washington place of 5,000+ has 2,694, so Black Diamond is less dense than the typical town.

What county Black Diamond is in

All of Black Diamond's residents live in King County, which had 2,340,211 residents in 2024. Black Diamond holds 0.3% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Black Diamond

1 ZIP Code Tabulation Area (ZCTA) overlaps Black Diamond by at least 10% of the ZCTA's or the city's land: 98010. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Black Diamond is

The Census internal point of Black Diamond is at 47.314700, -122.017700. Olympia, the capital, is 45.7 miles WSW in a straight line. The nearest larger place is Maple Valley, WA (28,553 people), 3.7 miles away. The nearest city of 100,000 or more is Kent, WA, 10.4 miles away.

Daylight in Black Diamond

At 47.31° N, Black Diamond gets about 15 h 57 min of daylight around the June solstice and 8 h 28 min around the December solstice, a swing of 7 h 29 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Black Diamond

The eight nearest incorporated places of 1,000+ in Washington, measured between internal points. The closest is Maple Valley, 3.7 miles away, with 28,553 people.