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
Washington County, Maryland age 18 and 9.50% of those age 65 or over. According to the Maryland Department of Business and Economic Development, the following were the major employers in the county (excluding post offices, state government, and local governments, but including public institutions of higher education): Washington County Public Schools administers public schools in the county. See "Washington County Public Schools – School Directory" for a detailed listing of elementary, middle, high, and other schools. Public high schools Private high schools Washington County, Maryland Washington County is located in the western part of the U.S. state of Maryland. As of the 2010