Colfax
- County:
- Whitman County
- County Seat:
- Yes
- Area (mi²):
- 3.783
- State:
- Washington
Colfax is a city located in Whitman County, Washington. Colfax has a 2026 population of 2,692. It is also the county seat of Whitman County. Colfax is currently growing at a rate of 0.45% annually but its population has decreased by -2.71% since the most recent census, which recorded a population of 2,767 in 2020.