Longview is a city in
Cowlitz County,
Washington, United States. It is the principal city of the "Longview, Washington
Metropolitan Statistical Area", which encompasses all of Cowlitz County. Longview's population was 36,648 at the time of the
2010 census and is the largest city in Cowlitz County. The city is located in southwestern Washington, at the junction of the
Cowlitz and
Columbia rivers. Longview shares a border with
Kelso to the east, which is the county seat.