Been a busy day, although I have some possible corrections for Montana.
Washington. The map is correct, WA does not honor a MT permit (it used to). Montana does honor their permits (which I saw is also correct on the map).
“Background checks are required if you’re purchasing a handgun from a Federal Firearms Dealer.” Actually, for purchase of any firearm from an FFL, unless you have a MT CCW permit, in which case the permit is sufficient. In other words, they do not call the NICS system.
Concealed carry outside of Incorporated Areas can be done without a permit, no specific reason needs to be given. You cannot conceal inside a bank, places that serve alcohol, churches, and the mining/logging camps.
From the website: Even with a concealed weapons permit, you may not carry a concealed weapon in the following places:
buildings owned or leased by the federal, state or local government financial institutions any place where alcoholic beverages are sold, dispensed and consumed