Lillington is a town and county seat of Harnett County, North Carolina, United States. Its population was 3,194 at the 2010 census, and was 4,735 in the 2020 census. Lillington is a part of the Dunn micropolitan area, which is also a part of the greater Raleigh–Durham–Cary combined statistical area as defined by the United States Census Bureau.

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.