Washington County Flag

Washington County

State:
Oregon
County Seat:
Hillsboro

Washington County's estimated 2025 population is 596,423 with a growth rate of -0.2% in the past year according to the most recent United States census data. Washington County is the 2nd largest county in Oregon. The 2010 population was 531,652 and has seen a growth of 12.18% since that time.

596,423
Total Population
824
Population Density (mi²)
2
Population Rank (State)
-1.2K -0.2%
Annual Population Growth

Washington County Population

Demographics

Economics and Income Statistics