Blackville is a small town in Barnwell County, South Carolina, United States. The population was 2,406 at the 2010 census. The town was named after Alexander Black, a railroad promoter. On December 22, 1781, a band of British Loyalists fought with a group of local Patriots two miles north of Blackville. The location, called Windy Hill at that time, is sligh…Blackville is a small town in Barnwell County, South Carolina, United States. The population was 2,406 at the 2010 census. The town was named after Alexander Black, a railroad promoter. On December 22, 1781, a band of British Loyalists fought with a group of local Patriots two miles north of Blackville. The location, called Windy Hill at that time, is slightly east of the present-day Healing Springs Park and Church. The commanding officer was Captain Benjamin Odom, Jr. who was a member of Colonel William Harden's regiment. Sixteen Patriots were killed. Major “Bloody Bill” Cunningham was believed to be the commander of the Tory company. The area was known for many years as "Slaughter Hill".