Population of New Castle, Pennsylvania as of September 2025. How many people live in New Castle today?

The exact population of New Castle, Pennsylvania as of September 2025 is estimated at 21,926 residents. Please note: this figure is an estimate and may slightly change as people get born and pass away, it also depends on migration to/from New Castle.

Check out more data on population in Pennsylvania:

• Population of Scranton
• Population of Altoona
• Population of Upper Darby
• Population of Millcreek
• Population of York
• Population of Penn Hills
• Population of Cranberry Township
• Population of Warminster
• Population of Tredyffrin
• Population of Whitehall Township
• Population of Shaler
• Population of Plum
• Population of East Hempfield
• Population of Lower Providence
• Population of Marple
• Population of Dover
• Population of Upper St. Clair