. "804" . . . . "4.8768"^^ . "Foster is an unincorporated community in Mathews County, Virginia, United States. Foster is located on Virginia Route 14 3.5 miles (5.6 km) west-northwest of Mathews. Foster has a post office with ZIP code 23056."@en . "-4" . "-5" . "Foster, Virginia"@en . "23056" . .