The term Tenmile Country refers to an area of land in Greene and Washington counties in southwestern Pennsylvania that is traversed by Tenmile Creek. After 1750, the Tenmile Country became a focal point for the migration of Scotch-Irish, German, and to a lesser extent, British, colonists. The Tenmile Country and Its Pioneer Familiescommences with an historical overview of settlement in the Tenmile Country, and it concludes with the aforementioned index of some 30,000 entries. In between, the genealogist of southwestern Pennsylvania can savor 500 or more family histories, of varying lengths, which delineate the lineages of the many families who migrated into this area.