In 1753, the northern part of Anson County became Rowan County. In 1762 the western part of the county became Mecklenburg County. In 1779 the northern part of the county became Montgomery County, and the part east of the Pee Dee River became Richmond County. And in 1842 the western part of Anson County was combined with the southeastern part of Mecklenburg County to make Union County.