New Castle is a city in Lawrence County, Pennsylvania, United States, 50 miles northwest of Pittsburgh and near the Pennsylvania-Ohio border just 18 miles east of Youngstown, Ohio; in 1910, the total population was 36,280; in 1920, 44,938; and in 1940, 47,638. The population has fallen to 23,273 according to the 2010 census. It is the county seat of Lawrence County. New Castle is the principal city of the New Castle micropolitan area and a part of the Pittsburgh-New Castle Combined Statistical Area, which is the 18th largest in the United States. It is the commercial center of a fertile... agricultural region. In 1798, John Carlysle Stewart, a civil engineer, traveled to western Pennsylvania to resurvey the "donation lands" resurveyed lands, which had been reserved for veterans of the Revolutionary War. He discovered that the original survey had neglected to stake out approximately 50 acres at the confluence of the Shenango River and the Neshannock Creek, at that time a part of Allegheny County. Claiming the land for himself, he laid out what was to become the town of New Castle. Stewart laid out the town of New Castle in April 1798.
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| County: | Lawrence County |
| State: | Pennsylvania |
| Population: | 24,060 |
| Also known as: | New Castle, Pennsylvania, New Castle, Lawrence County / New Castle city |