Yes. About 2.5 of the 3 million people living in the Denver/Boulder area live in the suburbs.
Denver
About 55 miles or an hour and a half in normal traffic driving. Measured from northern suburbs to southern suburbs.
Denver's northern suburbs extend to within a few miles of 40° North, but in summary, no.
A lot of King Soopers locations are open on holidays, albeit for limited hours.
According to a Google search, Denver, Colorado Springs, Aurora, Fort Collins & Lakewood. However, Aurora and Lakewood are suburbs of Denver. If I had to guess at the biggest cities in Colorado that include Denver as a general metro area, I would say Denver, Colorado Springs, Fort Collins, Pueblo, Boulder and Grand Junction.
Suburbs
Northern suburbs, Southern suburbs, Western suburbs, Eastern suburbs.
Aurora, Colorado. It's just borders Denver to the East. I live here and can't figure out why it's filmed here. Aurora is known as one of the "crappy suburbs".
Of or pertaining to suburbs; inhabiting, or being in, the suburbs of a city., One who dwells in the suburbs.
28 suburbs
The Suburbs ended in 1987.
The only airport in Colorado that many people would consider "major" is Denver International, which both serves a large urban and suburban area (including Denver, Boulder, Ft. Collins, Greeley, their suburbs, and Cheyenne, WY and Colorado Springs to a lesser extent) and is a major hub. Lesser airports serve other cities such as Grand Junction and several major ski resorts.