Black Diamond

Population

5,403 (2020)

Type

Town

Area

6.6 sq mi (17.09 km²), 0.59 sq mi water

Median age

40.7

Households

1,846

Persons per household

2.7

Median household income

$106,438

Average house value

$426,300

Businesses

125

Employees

646

Government

TOWN OF BLACK DIAMOND

Government office

PO BOX 599, BLACK DIAMOND, WA 98010