The currently historic alignment is present day Buckeye Rd or MC 85.

The historic alignment continued south on Oracle Road, entering Tucson.

Between Dyersville and Farley, US 20 follows its historic alignment.

The historic alignment in Missouri is marked based on the route in 1935.

From mile marker 3.25 to mile marker 6.50 in Dyer County represents the historic alignment of Tennessee State Route 20.

It locally follows 11th Street, the historic four-lane alignment of U.S. Route 50, through Tracy.

Much of State Road 6 follows the historic alignment of U.S. Route 66 and is signed as such.

For the majority of its routing through Arizona, I-40 follows the historic alignment of U.S. Route 66.

For the majority of its routing through Arkansas, I-40 follows the historic alignment of two separate United States highways.

The historic alignment turned northeast on Monmouth Blvd. through an industrial section between the former Santa Fe mainline to the north and the former CB&Q connector to the south.