urban and rural http://www.census.gov/geo/reference/urban-rural.html Urban and Rural Classification US Census Bureau census.gov Census Bureau http://www.census.gov/geo/reference/urban-rural.html urban-rural classification system census.gov Census Bureau http://www.census.gov/geo/reference/urban-rural.html census.gov urban-rural classification system Census Bureau defines rural as essentially the opposite of urban Census Bureau census.gov http://www.census.gov/geo/reference/urban-rural.html http://www.census.gov/geo/reference/urban-rural.html