Spokane County, Washington

Spokane County, Washington
Location within the U.S. state of Washington
Coordinates: 47°37′13″N 117°24′12″W / 47.620375°N 117.403371°W / 47.620375; -117.403371
Country United States
State Washington
FoundedJanuary 29, 1858 (created)
January 19, 1864 (annexed to Stevens Co.)
October 30, 1879 (separated from Stevens Co.)
Named afterSpokane people
SeatSpokane
Largest citySpokane
Government
 • SheriffJohn Nowels
Area
 • Total
1,780.984 sq mi (4,612.73 km2)
 • Land1,764.224 sq mi (4,569.32 km2)
 • Water16.760 sq mi (43.41 km2)  0.94%
Population
 (2020)
 • Total
539,339
 • Estimate 
(2024)
555,947
 • Density305.709/sq mi (118.035/km2)
DemonymSpokanite
Time zoneUTC−8 (Pacific)
 • Summer (DST)UTC−7 (PDT)
Area code509
Congressional district5th
Websitespokanecounty.gov

Spokane County is a county located in the U.S. state of Washington. As of the 2020 census, its population was 539,339, and was estimated to be 555,947 in 2024, making it the fourth-most populous county in Washington. The county seat and largest city is Spokane, the second largest city in the state after Seattle. The county is named after the Spokane people.

Spokane County is part of the Spokane metropolitan area, which is also part of the greater Spokane–Coeur d'Alene combined statistical area that includes nearby Kootenai County, Idaho.