I have that Westmoreland County was created in 1773 form Bedford Co., PA, but I am not sure what Counties were cut oif it after 1773. Westmoreland, Co., PA was created in 1773 from Bedford Co., PA Bedford Co, PA was created in 1771 from Cumberland Co., PA Cumberland Co., PA was created in 1750 from Lancaster Co., PA Lancaster Co. was created 14 Oct. 1728 from Chester Co., Chester was an original Co., formed in 1682 Thak you Mike Boyd Historical Committee, HBS