Chicago movers >> American highway codes >> American highway code US-21 to US-40 >> American highway code US 26
. U.S. Highway 320 is been part of the initial 1926 system, linking US 20 at Shoshoni with US 87W at Riverton (Wyoming).
. This becomes WYO 320 in 1938, which was extended southwest to Lander in 1940 when US 287 (which had replaced US 87W) was realigned.
. The real part of US 320/WYO 320 has become a part of an extension of US 26 in 1950, and the remaining of WYO 320 became part of WYO 789 in 1954.