Washington County, Maryland is included in the Hagerstown-Martinsburg, MD-WV Metropolitan Statistical Area, which is also included in the Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area. The closes states to Washington County is west Virginia, Pennsylvania, Virginia, and Tennessee. The western portions of the Province of Maryland (including present Washington County) were incorporated into Prince George's County in 1696. This original county included six current counties. The first to be created was Frederick, separated from Prince George's County in 1748. Following independence, the sovereign State of Maryland formed Washington County on September 6, 1776, by the division of Frederick County. At the same time, a portion
Maryland in the American Revolution capital of the colonies when the Second Continental Congress met there during December 1776 to February 1777, after Philadelphia had been threatened with occupation by the British "Redcoats". Towards the end of the struggle, from November 26, 1783, to June 3, 1784, the state's capital Annapolis, briefly served as the capital of the fledgling confederation government (1781-1789) of the United States of America, and it was in the Old Senate Chamber of the Maryland State House on State Circle in Annapolis that General George Washington famously resigned his commission as commander in chief of the Continental Army on December 23,