what county is new castle,pa in
New Castle, PA New Castle is a city in Lawrence County, Pennsylvania, United States, 50 miles (80 km) northwest of Pittsburgh and near the Pennsylvania-Ohio border just 18 miles (29 km) east of Youngstown, Ohio; in 1910, the total population was 36,280; in 1920, 44,938; and in 1940, 47,638.