Erwin is a town that is located in the eastern part of Harnett County, North Carolina, United States, located approximately 5 miles (8.0 km) from Dunn and approximately 20 miles (32 km) from Fayetteville. The city is a part of the Dunn, NC Micropolitan Statistical Area, which is additionally a part of the greater Raleigh-Durham-Cary, NC CSA, according to the United States Census Bureau. Currently, the city has a population of 5,270 as of the 2020 census. Its current mayor is Randy Baker, who has been the mayor since being elected on May 17, 2022.

Harnett County is a county located in the U.S. state of North Carolina. As of the 2020 census, the population was 133,568. Its county seat is Lillington; its largest community is Anderson Creek. Harnett County is part of the Anderson Creek, NC Micropolitan Statistical Area.