port allegany is in what county
Sponsored Topics. Port Allegany is a borough in McKean County, Pennsylvania, United States. The population was 2,355 at the 2000 census. Port Allegany is located at 41Â°48â²54â³N 78Â°16â²45â³W / 41.815Â°N 78.27917Â°W / 41.815; -78.27917 (41.814919, -78.279218). According to the United States Census Bureau, the borough has a total area of 1.8 square miles (4.7 kmÂ²), all of it land.