US 168 was an original 1926 route, with its east terminus in Mt. Vernon. The west endpoint was in Louisville. US 168 lasted only about seven years: in 1934, US 150 was extended eastward, and it subsumed the entirety of what had been US 168.
Research and/or photo credits: Dale Sanderson; Michael Summa
Page originally created 2005; last updated Feb. 21, 2021.