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New Castle is a city in and the county seat of Lawrence County, Pennsylvania, United States, 50mi northwest of Pittsburgh and near the Pennsylvania–Ohio border just 18mi east of Youngstown, Ohio. The population was 23,128 as of the 2010 census. It is the commercial center of a fertile agricultural region.New Castle is the principal city of the New Castle, PA Micropolitan Statistical Area, which had a population of 91,108 in 2010. New Castle also anchors the northwestern part of the Pittsburgh-New Castle-Weirton, PA-WV-OH Combined Statistical Area.HistoryIn 1798, John Carlysle Stewart, a civil engineer, traveled to western Pennsylvania to resurvey the "donation lands," which had been reserved for veterans of the Revolutionary War. He discovered that the original survey had neglected to stake out approximately 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. It comprised approximately that same, in what was then part of Allegheny County.In 1825, New Castle became a borough, having a population of about 300. The city later became a part of Mercer County. On April 5, 1849, the Governor of the Commonwealth of Pennsylvania signed an act creating Lawrence County named in honor of U.S. Navy Captain James Lawrence. New Castle became a city in 1869 and was headed by its first Mayor, Thomas B. Morgan. At that time, the population had increased to about 6,000.New Castle is in Pennsylvania (PA). Plan your trip to New Castle and other United States destinations using our handy United States trip planning tool .
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