Longview Heights is a census-designated place (CDP) in Cowlitz County, Washington, United States.

As of the census[2] of 2000, there were 3,513 people, 1,320 households, and 1,028 families residing in the CDP.

The racial makeup of the CDP was 95.16% White, 0.40% African American, 0.94% Native American, 1.42% Asian, 0.09% Pacific Islander, 0.43% from other races, and 1.57% from two or more races.

There were 1,320 households, out of which 34.4% had children under the age of 18 living with them, 66.4% were married couples living together, 7.4% had a female householder with no husband present, and 22.1% were non-families.

16.7% of all households were made up of individuals, and 4.8% had someone living alone who was 65 years of age or older.