Franklin County, Washington

Franklin County, Washington
The Franklin County Courthouse in Pasco
Location within the U.S. state of Washington
Coordinates: 46°32′15″N 118°54′14″W / 46.537502°N 118.903891°W / 46.537502; -118.903891
Country United States
State Washington
FoundedNovember 28, 1883
Named afterBenjamin Franklin
SeatPasco
Largest cityPasco
Government
 • SheriffMarcus Conner
Area
 • Total
1,264.959 sq mi (3,276.23 km2)
 • Land1,241.596 sq mi (3,215.72 km2)
 • Water23.363 sq mi (60.51 km2)  1.85%
Population
 (2020)
 • Total
96,749
 • Estimate 
(2024)
101,238
 • Density77.923/sq mi (30.086/km2)
Time zoneUTC−8 (Pacific)
 • Summer (DST)UTC−7 (PDT)
Area code509
Congressional districts4th, 5th
Websitefranklincountywa.gov

Franklin County is a county located in the U.S. state of Washington. As of the 2020 census, its population was 96,749, and was estimated to be 101,238 in 2024. The county seat and largest city is Pasco.

The county was formed out of Whitman County on November 28, 1883, and is named for Benjamin Franklin.

Franklin County is included in the Tri-Cities metropolitan area. Together, Kennewick, Richland and Pasco comprise Washington's Tri-Cities.