Durham is a city in the U.S. state of North Carolina and the county seat of Durham County. Small portions of the city limits extend into Orange County and Wake County. With a population of 283,506 in the 2020 census, Durham is the fourth-most populous city in North Carolina and the 70th-most populous city in the United States. The city is located in the east-central part of the Piedmont region along the Eno River. Durham is the core of the four-county Durham–Chapel Hill metropolitan area, which had an estimated population of 608,879 in 2023. The Office of Management and Budget also includes Durham as a part of the Raleigh–Durham–Cary, NC Combined Statistical Area, commonly known as the Research Triangle, which had an estimated population of 2,368,947 in 2023.