 In 1936, this was changed to continue north past Ohioville, allowing PA 168 to extend up through New Castle/Lawrence County and to its new northern terminus at PA 208 in Leesburg/Mercer County.In 1959, nearby PA 278 was decommissioned and replaced as a realignment of PA 208; thus, PA 168 and PA 208 ran concurrent for the former's last three miles.By 1970, PA 168's northern terminus was truncated to its current location at the PA 208 junction in Volant/Lawrence County.