Counties come, counties go. The General Assembly has created 166 counties since 1634, but there are only 95 in Virginia now.
Virginia's counties were created to meet the needs of the English settlers, based on English laws and customs. The native Americans had their own way of organizing their territories, and for all we know one day the Martians may conquer the area and divvy up the spoils in yet a different way. [Think the natives in 1607 considered the English immigrants to be any stranger than we would consider Martians, if they landed out of the blue?]
Virginia-Created Counties That Are Now Extinct
Virginia-Created Counties That Are Now in Kentucky
Virginia-Created Counties That Are Now in Pennsylvania, Ohio, Indiana, Illinois, Michigan, Minnesota, and Wisconsin
Virginia-Created Counties That Are Now in West Virginia
And Then There are the Name Changes...