Whitman County, Washington

Whitman County
Location within the U.S. state of Washington
Washington's location within the U.S.
Coordinates: 46°53′N 117°31′W / 46.89°N 117.52°W / 46.89; -117.52
Country United States
State Washington
FoundedNovember 29, 1871
Named afterMarcus Whitman
SeatColfax
Largest cityPullman
Area
  Total
2,178 sq mi (5,640 km2)
  Land2,159 sq mi (5,590 km2)
  Water19 sq mi (50 km2)  0.9%
Population
 (2020)
  Total
47,973
  Estimate 
(2024)
48,399
  Density22/sq mi (8/km2)
Time zoneUTC−8 (Pacific)
  Summer (DST)UTC−7 (PDT)
Congressional district5th
Websitewhitmancounty.org

Whitman County is a county located in the U.S. state of Washington. As of the 2020 census, the population was 47,973. The county seat is Colfax, and its largest city is Pullman.

The county was formed from Stevens County in 1871. It is named after Marcus Whitman, a Presbyterian missionary who, with his wife Narcissa, was killed in 1847 by members of the Cayuse tribe.

Whitman County comprises the Pullman, Washington Metropolitan Statistical Area.