It's becoming more difficult to keep up with how large Montana's cities have become, mostly because they keep growing at an impressive rate. There was a time where Montana license plate numbers would immediately let you know what county the car was from - the first number reflected the county size, in order, decades ago.
Oh and here is something interesting, this isn't a new thing. One person said, and I quote "when we moved here 30 years ago, grown men would flip me off with my children in the car."