U.S. Highway 14A (US 14A) is an alternate route for US 14 between Cody and Burgess Junction. At its west end in Cody, US 14 is concurrent with US 16 and US 20. West of Burgess Junction, US 14A passes through the Bighorn Mountains, reaching a maximum elevation of . This portion of the road is closed during the winter months, which typically is at the end of the fall hunting season, around December 1, to Memorial Day weekend, or as conditions allow. The total length of US 14A is approximately . Intermediate towns on the highway include Powell and Lovell. At Lovell, US 14A is concurrent with US 310 for approximately . US 14A is also known as the Medicine Wheel Passage between Lovell and Burgess Junction.
In the initial 1925 plan, roughly the west half of present US 14A, from Cody to US 310 in Deaver, was assigned the number U.S. Highway 220 (US 220). However, two spurs of US 20 were added in Pennsylvania, and so US 220 became U.S. Highway 420 (US 420) in the final 1926 plan.
Around 1933, US 116 was extended west from Sheridan to Deaver, then absorbing US 420 to end at Cody. Soon after, it became part of an extended US 14. US 14 was shifted south to its present alignment in 1940, and the old alignment became WYO 14 for a while and was recommissioned as US 14A around 1965.