City and County of Denver : is the capital and the most populous city of the state of Colorado, USA. As Denver County, it is the second most populous county in Colorado right after El Paso County, which surpassed Denver County as of the 2010 Census. Denver is a consolidated city-county, located in the South Platte River Valley on the western edge of the High Plains just east of the Front Range of the Rocky Mountains. The Denver downtown district is located immediately east of the confluence of Cherry Creek with the South Platte River, approximately 12 miles (19 km) east of the foothills of the Rocky Mountains. Denver is nicknamed the Mile-High City because its official elevation is exactly one mile (1.6 km) or 5,280 feet (1,609.344 m) above sea level.The 105th meridian west of Greenwich passes through Union Station and is the temporal reference for the Mountain Time Zone.The population of Denver was 600,158 according to the 2010 census which ranks it as the 27th most populous U.S. city
Denver International Airport : often referred to as DIA, is an airport in Denver, Colorado. By land size, at 53 square miles (140 km2), it is the largest international airport in the United States, and the third largest international airport in the world after King Fahd International Airport and Montréal-Mirabel International Airport.Runway 16R/34L is the longest public use runway in the United States. In 2010, Denver International Airport was the 10th-busiest airport in the world by passenger traffic with 52,209,377 passengers.
It was the fifth-busiest airport in the world by aircraft movements with over 635,000 movements in 2010.The airport is located in northeastern Denver, Colorado, and is operated by the City and County of Denver. Denver International Airport is the busiest and largest airport in the United States without non-stop service to and from Asia, although the airport is actively seeking such flights. DIA was voted Best Airport in North America by readers of Business Traveler Magazine six years in a row (2005–2010) and was named "America's Best Run Airport" by Time in 2002.
Denver International Airport is the main hub for low-cost carrier Frontier Airlines and commuter carrier Great Lakes Airlines. It is also the fourth-largest hub for United Airlines. The airport is a focus city for Southwest Airlines. Since commencing service to Denver in January 2006, Southwest has added over 40 destinations, making Denver its fastest-growing market. Denver International Airport is the only airport in the United States to have designed and implemented an ISO 14001-certified environmental management system that covers the entire airport.
Colorado's transportation network : consists of a network of of highway, surface street, rail, and air transportation options. While the public transportation system in Denver is much more complex and developed than other parts of the state, tourism and growth have led to extensive needs statewide.
Colorado is a landlocked state, so ground and air transportation are the primary focus of the state. Also, due to low population density outside of the Denver and Colorado Springs metropolitan areas, highways are the primary transportation method for the majority of residents.
Due to winter weather conditions, sections of I-70 are regularly closed during the winter and are expensive to maintain.
Interstates I-225 and I-270 provide connection though heavy traffic corridors in the Denver Area. I-76 connects the Denver area with Interstate 80 in Nebraska to the Northeast.