Burke, Idaho is, for practical purposes, a ghost town
(Wallace, ID is the "big" town in the area, population circa 1100.)
All inter-state dialing in that vicinity is 1+areacode+number.` Pretty much the entire width of the state is the "local calling area", less than 30 miles _west_ gets you into WA state.
Telco switching offices are "few and far between" up there -- population density is *low*. I know there's one in Wallace, and one in Sand Point. I think there's also one in Cour D'elane, and maybe Kellogg.
The feds regulated max rates for (domestic U.S.) inter-state calls, and a formula based strictly on distance was employed -- Burke (vicinity) to Thomas Falls would have been about the same as Omaha NE to Council Bluffs IA, or Souix City IA to South Souix City SD.