The Denver area is a region in Colorado, a state of the United States of America. It is centered on the city of Denver, Colorado's capital and largest city, but includes some outlying areas as well.
Roughly speaking, this region is comprised of Jefferson and Douglas Counties, the western halves of Adams and Arapahoe Counties, and the combined city–counties of Denver and Broomfield. 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 International Airport, (IATA: DEN). 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 +1 303 342-2000.
RTD serves as both light rail within Denver and commuter rail for the surrounding area.