
Franklin County
- State:
- Washington
- County Seat:
- Pasco
Franklin County's estimated 2025 population is 99,938 with a growth rate of 0.45% in the past year according to the most recent United States census data. Franklin County is the 14th largest county in Washington. The 2010 population was 79,076 and has seen a growth of 26.38% since that time.