 aldan is a borough in delaware county, pennsylvania, united states. the population was 4,152 at the 2010 census. ==geography== according to the united states census bureau, the borough has a total area of , all of it land. ==demographics==  as of the census of 2000, there were 4,313 people, 1,751 households, and 1,157 families residing in the borough. the population density was 7,235.4 people per square mile (2,775.4/kmÂ²). there were 1,817 housing units at an average density of 3,048.1 per square mile (1,169.2/kmÂ²). the raci
Boroughs_in_Delaware_County,_Pennsylvania Boroughs_in_Pennsylvania Populated_places_established_in_1893