Roughly speaking, this region is comprised of Jefferson, Douglas, Denver and Broomfield Counties, with the Western halves of Adams and Arapahoe Counties. It is bounded on the:
Region boundaries in Colorado are indistinct, and sometimes contentious. If you're looking for a destination/attraction that you think should be in this region, but can't find it, check the pages for South Central Colorado, Eastern Plains, and Front Range.
Denver Area Suburbs
Denver International Airport , (IATA: DEN, ICAO: KDEN). Commonly referred to as DIA. It is located about 20 miles to the east of downtown Denver. Frontier Airlines, United Airlines, and Southwest Airlines all maintain hubs at the airport in Concourses A, B, and C respectively. Most other major domestic carriers also have service here. Information can be obtained by calling (303) 342-2000.
As anywhere, always be aware of your surroundings, especially in poor areas. Except for the Western suburbs, and the Stapleton and Montebello neighborhoods of Northeast Denver, most of the areas along I-70 in the Denver Metro are industrial and impoverished, and might be best avoided (at least at night) if you're unfamiliar with these areas. Westside Denver is a poor area as well. But despite all mentioned though, the Denver Metropolis is a lot safer than many other American cities and their metros, just use caution when you are in a area that looks shady to you.