Yokota FritzDenver, Colo. Pop. 588,349
Denver’s mile-high sprawl is a lot easier to navigate thanks to one of the leading transit systems in the West. An established network of light rail and buses connects the city’s grid, all centered at the downtown Union Station. The voter-approved FasTracks plan will extend rail and bus lines into the suburbs, reaching into eight counties. And the Rocky Mountain Rail Authority hopes to run high-speed trains (up to 300 mph) along the oft-choked I-25 and I-70 corridors that traverse the state (though Colorado was among the states that got no love in President Obama’s national high-speed rail plan).