wiinemucca
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.
181 miles
Dunlap, CA.
Monticello, UT
It is roughly 1700 miles from Boise, ID to Chicago, IL. The halfway point between these two cities would be 850 miles, which would put you around Sidney, Nebraska.
Fairfax, MO
La Grande, OR
Price, UT
Forsyth, MT
Cartago, CA
McCloud, CA