  allegheny township is a township in somerset county, pennsylvania, united states. the population was 654 at the 2000 census. it is part of the johnstown, pennsylvania united states metropolitan area. ==geography== according to the united states census bureau, the township has a total area of , all of it land. ==demographics== as of the census of 2000, there were 654 people, 250 households, and 185 families residing in the township. the population density was 12.6 people per square mile (4.9/kmÂ²). there were 442 housing units at an average density of 8.5/sq&nbsp;mi (3.3/kmÂ²). the racial makeup of the township was 97.86% white, 0.31% asian, 1.68% from other races, and 0.15% from two or more races. hispanic or latino of any race were 1.68% of the population. there were 250 households out
Townships_in_Pennsylvania Townships_in_Somerset_County,_Pennsylvania