For your information, Lehigh County was incorporated in 1812. Prior to that year search the courthouse of Northampton County (Easton, PA). Lehigh County does not have many official papers prior to the 1906 acts that required birth / death registrations. For early marriages, it would be best to search church records. The Koch(er) family was primarily found in South Whitehall (then Whitehall Twsp), Upper Macungie, Wisenburg Twsps. The immigrant of my line of Koch's was a member of the Jordan Lutheran Church in South Whitehall Twsp ( the Whitehall Twsp), Lehigh County (then Northampton County). Jim