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
Summerfield, Maryland Summerfield, Maryland Summerfield is a census-designated place near Landover in Prince George's County, Maryland, in the United States. The population of the CDP was 10,898 at the 2010 census. It is a suburb of Washington, D.C. Fedex Field is located in Summerfield CDP, as is the Prince George's County Sports and Learning Complex. Prior to the 2010 Census, the area was not covered by another census-designated place. According to the U.S. Census Bureau, Summerfield has a total area of , of which , or 0.03%, is water. The CDP is bordered to the east by the Capital Beltway (I-495/95) and