South New Castle, Pennsylvania

South New Castle, Pennsylvania
Municipal building
Location in Lawrence County, Pennsylvania
Coordinates: 40°58′32″N 80°20′41″W / 40.97556°N 80.34472°W / 40.97556; -80.34472
CountryUnited States
StatePennsylvania
CountyLawrence
Established1901
Planned MergerJanuary 1st, 2026
Government
  MayorJoseph Woryk
Area
  Total
0.32 sq mi (0.84 km2)
  Land0.32 sq mi (0.84 km2)
  Water0.00 sq mi (0.00 km2)
Elevation
(middle of borough)
1,000 ft (300 m)
Highest elevation
(southwest corner of borough)
1,100 ft (300 m)
Lowest elevation
(Big Run)
840 ft (260 m)
Population
 (2020)
  Total
647
  Density1,996.91/sq mi (770.53/km2)
Time zoneUTC-4 (EST)
  Summer (DST)UTC-5 (EDT)
Area code724

South New Castle is a borough in central Lawrence County, Pennsylvania, United States. The population was 649 at the 2020 census. It is primarily a residential community which lies south of the city of New Castle, and is part of the Pittsburgh metropolitan area. The borough will officially be annexed into nearby Shenango Township on January 1, 2026.