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

As of the census[1] of 2000, there were 753 people, 251 households, and 200 families residing in the CDP.

There were 256 housing units at an average density of 52.2/sq mi (20.2/km2).

There were 251 households, out of which 43.0% had children under the age of 18 living with them, 69.7% were married couples living together, 6.0% had a female householder with no husband present, and 20.3% were non-families.

12.4% of all households were made up of individuals, and 2.4% had someone living alone who was 65 years of age or older.