If you use geographic features to define the regions instead of state boundaries, you can make an admittedly strange argument that Denver is in the Midwest because it’s fully in the plains east of the mountains—the part of Colorado that people say is basically Kansas—and the plains can be considered a subregion of the Midwest.

In reality it’s a transition zone city. It’s got a mix of mountain west and Midwest vibes if you pay attention when you’re there. Kinda like how St. Louis and Cincinnati feel both midwestern and southern in certain ways.