I generally like to have a game play that the map is a state and districts are "cities" in that state. Here is the state of Tetonia. It is in the far northern plains of North America. The largest city is Teton City which has a population of about 24,000. Teton City is the anchor city of the main urban area in the state which houses about 42,000.
This city takes inspiration from large mountain cities in the US and Canada like Salt Lake City, Denver, Calgary, and Edmonton.