As of 2021, the estimated population of Harnett County, North Carolina is around 136,000 residents.

The address of the Harnett County Historical Society Foundation Inc is: 1988 Old Buies Creek Rd, Angier, NC 27501-7002

The report that became known as the Halifax Resolves was written by Cornelius Harnett. Harnett was born in Chowan County, North Carolina in April of 1723. He was a merchant who became immersed in public affairs.

No same-sex couples have legally married in Harnett county. Although North Carolina's ban on same-sex marriage was struck down as unconstitutional by the United States Court of Appeals for the 4th Circuit on July 28, 2014, that decision is temporarily stayed for at least 21 days.

The web address of the Harnett Historical Association is: http://harnetthistoricalassociation.