 merrimac is a census-designated place (cdp) in montgomery county, virginia, united states. the population was 2,133 at the 2010 census. it is part of the blacksburg&ndash;christiansburg&ndash;radford metropolitan statistical area which encompasses all of montgomery county and the city of radford. ==history== according to one source, merrimac was so named because coal from area mines was used on css virginia (formerly uss merrimack). a post office cal
BlacksburgaChristiansburgaRadford_metropolitan_area Census-designated_places_in_Montgomery_County,_Virginia Census-designated_places_in_Virginia Coal_towns_in_Virginia