Resident Population in Harnett County, NC was 146.09600 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Harnett County, NC reached a record high of 146.09600 in January of 2024 and a record low of 49.66700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Harnett County, NC - last updated from the United States Federal Reserve on April of 2026.