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New Castle is a city in and the county seat of Lawrence County, Pennsylvania, United States. Located along the Shenango River at the mouth of Neshannock Creek, it is 43 miles (69 km) northwest of Pittsburgh near the Pennsylvania–Ohio border, approximately 17 miles (27 km) southeast of Youngstown, Ohio. As of the 2020 census, the city had a population of 21,926. The commercial center of a fertile agricultural region, New Castle is included in the northwestern part of the Pittsburgh metropolitan area.

The Lawrence County Courthouse is an historic, American courthouse building that is located in New Castle, Lawrence County, Pennsylvania. It was added to the National Register of Historic Places in 1978.

The Scottish Rite Cathedral in New Castle, Pennsylvania, United States, was designed by Milwaukee architect R. G. Schmidt and built in 1925. First used in November 1926 as a meeting place for Masonic groups, it is listed in the National Register of Historic Places in Lawrence County, Pennsylvania. Unable to pay taxes during the Great Depression, the Masons lost the building to the county, but reacquired it in 1940 with the creation of the Cathedral Foundation. This non-profit foundation continues to operate the Cathedral today.

New Castle Junior/Senior High School is a public school located in New Castle, Pennsylvania in Lawrence County. It is the only high school in the New Castle Area School District, which serves New Castle and Taylor Township. It was originally founded in 1879. The school is a combined junior high school and senior high school, educating students in 6th through 12th grades. Its total student population is 1,524 as of the 2021-22 school year. It has a student-to-teacher ratio of 16.9 to 1.

Neshannock Creek is a 25.65 mi (41.28 km) long tributary to Shenango River that forms at the confluence of Cool Spring and Otter Creek in Mercer County and then flows south to Lawrence County, Pennsylvania. This creek is known for its fly fishing at Volant, Pennsylvania.Neshannock is a Native American name purported to mean "double stream".

The North Hill Historic District is a residential neighborhood in the city of New Castle, Pennsylvania, that was entered into the National Register of Historic Places in 1999. The 91-block district consists of roughly 450 acres (1.8 km2) of land that sit slightly north of New Castle's business district. The area is historic due to the many ornate homes and mansions—many dating back to the 19th century—that lie within its boundaries.

Lawrence County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 86,070. The county seat and largest city is New Castle.The county was created on March 20, 1849, from parts of Beaver and Mercer counties. It was named after the flagship of Commodore Oliver Hazard Perry, the USS Lawrence. Lawrence County is part of the Pittsburgh, PA Metropolitan Statistical Area.

Oakland is an unincorporated area and census-designated place (CDP) in Lawrence County, Pennsylvania, United States. The population was 1,569 at the 2010 census.

New Castle Area School District is a public school district located in Lawrence County, Pennsylvania. The district serves the city of New Castle and Taylor Township. New Castle Area School District encompasses approximately 14 square miles (36 km2). According to 2017 Census Estimates, the district served 22,069 residents, down from 23,273 residents in the 2010 Census.New Castle Area School District operates four schools: Croton Pre-Kindergarten, Harry W. Lockley Early Learning Center, George Washington Intermediate School, and New Castle Junior/Senior High School.

New Castle Northwest is an unincorporated area and census-designated place (CDP) in Lawrence County, Pennsylvania, United States. The population was 1,413 at the 2010 census.

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 a connecting township on January 1, 2026.

New Castle Armory is a historic National Guard armory located at Shenango Township, Lawrence County, Pennsylvania. It was built in 1938, and is an "I"-plan stone building consisting of a one- to two-story administration building, with a connected riding hall and former stable building. It was built as a Federal public works project and is in the Art Deco style.It was added to the National Register of Historic Places in 1991.