depending on where you happen to be running from them in the Mile High City, you may also encounter these:
DHS police. Usually hanging around the federal courthouse, which is their primary jurisdiction.
Our US mint has its own police force.
Campus police. Glorified seccas, really.
Aurora PD. just east of Denver.
Colorado State Patrol. Usually, these guys will pull you over on the way back from 'splorin. On the highway. Unless you're UEing the Capitol, because they guard that.
Denver PD also has horses.
Arapahoe County Sheriff. this will be the guy most likely coming in a missile hole after you.