On December 23, 1776, the Washington District was established in what was commonly referred to by locals as the "Squabble State." Since the NC/VA State Line had not been surveyed westward to this location, many settlers considered themselves to be Virginians. To make matters worse, Virginia created a Washington County in essentially the same area, however, it too had not been surveyed.

On December 18, 1777, the Washington District was renamed to Washington County. It was not until 1779/1780 when the NC/VA State Line was finally surveyed. North Carolina's Washington County was now directly opposite of Virginia's Washington County.

NC created Sullivan County in 1779 out of part of Washington County. Both Sullivan County and Washington County were part of the Salisbury District Brigade of Militia until May of 1782 when the Morgan District Brigade of Militia was created.

In 1783, NC created Greene County out of part of Washington County.

The Washington County Regiment was active until the end of the war. Units of this regiment were known to have participated in the following known battles/skirmishes: