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.
According to Heart of Washington, Whitman County produces more barley, wheat, dry peas, and lentils than any other county in the United States.
Whitman County is part of the Palouse, a wide and rolling prairie-like region of the middle Columbia basin.
