 lower allen is a census-designated place (cdp) in lower allen township, cumberland county, pennsylvania, united states. the population was 6,694 at the 2010 census. it is part of the harrisburg&ndash;carlisle metropolitan statistical area. ==geography== lower allen is located at  (40.227990, -76.902305). according to the united states census bureau, the cdp has a total area of , all of it land. ==demographics== as of the census of 2000, there were 6,619 people, 3,031 households, and 1,851 families residing in the cdp. the population density was 2,827.7 people per square mile (1,092.1/kmÂ²). there were 3,131 housing units at an average density of 1,337.6/sq&nbs
Census-designated_places_in_Cumberland_County,_Pennsylvania Census-designated_places_in_Pennsylvania Harrisburg_metropolitan_area