County Durham | Orange County | County Cork | St. Louis County, Minnesota | County Galway | County Mayo | county | Montgomery County | Los Angeles County Museum of Art | Lancashire County Cricket Club | Westchester County, New York | Nassau County, New York | County Antrim | Rockland County, New York | County Down | Washington County | Hillsborough County | Derby County F.C. | County Meath | County Donegal | Erie County, New York | County Tyrone | County Tipperary | County Louth | County Armagh | Wayne County, Michigan | Somerset County Cricket Club | Los Angeles County | Jefferson County | Glamorgan County Cricket Club |
With very rare exceptions (such as County Route 537), the 500 series follows the rule of cardinal direction used for Interstate Highways and U.S. Routes: even-numbered roads run east and west, while odd-numbered roads run north and south.