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Taylor, Idaho is the halfway point.
North Dakota
La Grande, OR
Erie, CO
The halfway point when driving is Lexington, Nebraska, exit 237 off I-80.
The halfway point is Gandy, UT.
Geographically speaking, there is no city on the exact point between St. George and Provo, But taking I-15, Cove Fort is the closest halfway point between the two locations.
The halfway point is basically the area where Nebraska, Colorado and Wyoming meet. This is not an exact answer, but in relative terms this is the halfway point between Salmon, Idaho and Kansas City, Missouri. If your looking for a town, then I would say the capitol city of Wyoming (Cheyenne) is pretty much as close as your going to get to a city halfway between Salmon and K.C.
Pendleton, Oregon, seems to be about halfway between Boise and Tacoma. The Tri-Cities are nearby the halfway point, and they are a larger metro area.
A city halfway between Billings MT & Chicago IL could be Sioux Falls SD, depending on your route.
halfway between Moscow id and port orchard WA
The nearest city to half way between Idaho Falls Idaho and Rapid City SD is Casper, Wyoming. But, it is somewhat closer to Rapid City.