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

[5] According to the United States Census Bureau, the CDP has a total area of 11.3 square miles (29 km2), all of it land.

As of the census[2] of 2000, there were 2,510 people, 838 households, and 682 families living in the CDP.

There were 859 housing units at an average density of 75.7 per square mile (29.2/km2).

13.7% of all households were made up of individuals, and 4.5% had someone living alone who was 65 years of age or older.