Rowan County was formed in 1753 from Anson County. This county has seen many border changes over the years that researchers should be aware. See The Formation of the North Carolina Counties, 1663-1943, by David Leroy Corbitt for a complete history of the county formation.
This book that might be of interest. A History of Rowan County, North Carolina, Containing Sketches of Prominent Families and Distinguished Men.