Weallup Lake is a former census-designated place (CDP) in Snohomish County, Washington, United States.

As of the census[1] of 2000, there were 882 people, 452 households, and 273 families residing in the CDP.

The racial makeup of the CDP was 94.90% White, 0.11% African American, 1.25% Native American, 0.45% Asian, 0.57% Pacific Islander, 1.02% from other races, and 1.70% from two or more races.

There were 452 households, out of which 12.4% had children under the age of 18 living with them, 54.2% were married couples living together, 4.0% had a female householder with no husband present, and 39.6% were non-families.

33.6% of all households were made up of individuals, and 14.4% had someone living alone who was 65 years of age or older.