what county is east petersburg pa in
East Petersburg, PA. Sponsored Topics. East Petersburg is a borough in Lancaster County, Pennsylvania, United States. The population was 4,450 at the 2000 census. East Petersburg is located at 40Â°6â²0â³N 76Â°21â²10â³W / 40.1Â°N 76.35278Â°W / 40.1; -76.35278 (40.100079, -76.352649).