Rockingham County was named for Charles Watson-Wentworth, a second marquis of Rockingham, who supported the colonists in their disputes with Great Britain. It was formed from Augusta County in 1778.

Created in 1778. A courthouse fire in 1787 destroyed wills and estate records, primarily. In June 1864 during the Civil War, court records (mostly volumes) were removed from the courthouse and loaded on a wagon to be taken to place of safety on or beyond the Blue Ridge. The wagon was overtaken by Union troops near Port Republic and set on fire, which was put out by local citizens. Many order books, deed books, will books, and fiduciary books, however, were lost or severely damaged by the fire. The loose records that remained at the courthouse were undamaged. Pre-1865 records including deeds and wills were rerecorded following an act of assembly passed in November 1884.