From an interview perspective, the interview will be according to where you are attending school. And NMSF, of course, is based upon the location of the school.
From a pure admissions perspective, since intl students attending BS in the US are considered intl for college admissions, I would think that from a geographic diversity perspective (which I’m not sure how meaningful that really is), the college would consider the applicant as from MT. However, it probably varies by college.