 arlington heights is a census-designated place (cdp) in snohomish county, washington, united states. the population was 2,284 at the 2010 census. ==geography== arlington heights is located at  (48.208682, -122.052999). according to the united states census bureau, the cdp has a total area of 11.3&nbsp;square miles (29.4&nbsp;kmÂ²), all of it land. ==demographics== as of the census of 2000, there were 2,510 people, 838 households, and 682 families residing in the cdp. the population density was 221.3 people per square mile (85.5/kmÂ²). there were 859 housing units at 
Census-designated_places_in_Snohomish_County,_Washington Census-designated_places_in_Washington_(state)