Green Spring is an unincorporated railroad town in Hampshire County, West Virginia, USA. Green Spring is located north of Springfield on Green Spring Road (West Virginia Secondary Route 1) near the confluence of the North and South Branches of the Potomac River. Green Spring is also the location of the South Branch Valley Railroad's terminus with the old Baltimore & Ohio Railroad mainline. Green Spring is the site of a one-lane low water toll bridge that connects Green Spring Road (West Virginia Secondary Route 1) to Maryland Route 51 in Oldtown, Allegany County, Maryland. According to the 2000 census, the Green Spring community has a population of 581.