The United States Census Bureau estimates that the population of the City and County of Denver was 598,707 in 2008, making it the 26th most populous U.S. city.The 5-county Denver-Aurora Metropolitan Statistical Area had an estimated 2008 population of 2,506,626 and ranked as the 21st most populous U.S. metropolitan statistical area and the 12-county Denver-Aurora-Boulder Combined Statistical Area had an estimated 2008 population of 3,049,562 and ranked as the 16th most populous U.S. metropolitan area. The 18-county Front Range Urban Corridor had an estimated 2007 population of 4,166,855. It is also the second largest city in the Mountain West after Phoenix. The city has the 10th largest central business district in the United States.
The United States Census Bureau estimates that, in 2008, the population of the City and County of Denver was 598,707, making it the 26th most populous U.S. city. The Denver-Aurora Metropolitan Statistical Area had an estimated 2006 population of 2,464,866 and ranked as the 21st most populous U.S. metropolitan statistical area, and the larger Denver-Aurora-Boulder Combined Statistical Area had an estimated 2006 population of 2,927,911 and ranked as the 17th most populous U.S. metropolitan area. Denver is the most populous city within a radius centered in the city and of 550 miles (885 km) magnitude. Denverites is a term used for residents of Denver (city or county).
According to census estimates, the City and County of Denver contains approximately 566,974 people (2006) and 239,235 households (2000). The population density is 3,698/sq mi (1,428/km²). There are 268,540 housing units (2005) at an average density of 1,751/sq mi (676/km²). However, the average density throughout most Denver neighborhoods tends to be higher. Without the 80249 zip code (47.3 sq mi, 8,407 residents) near the airport, the average density increases to around 5,470/sq mi.
According to the 2005-2007 American Community Survey, the city's population was 74.5% White (50.5% non-Hispanic-White alone), 10.8% Black or African American, 1.9% American Indian and Alaska Native, 3.7% Asian, 0.2% Native Hawaiian and Other Pacific Islander, 11.6% from some other race and 2.4% from two or more races. 34.2% of the total population were Hispanic or Latino of any race . 69.9% of the city's population spoke only English at home and 23.9% spoke Spanish. 37.7% of Denver's population had a Bachelor's degree or higher.
There are 250,906 households, out of which 23.2% have children under the age of 18 living with them, 34.7% are married couples living together, 10.8% have a female householder with no husband present, and 50.1% are non-families. 39.3% of all households are made up of individuals and 9.4% have someone living alone who is 65 years of age or older. The average household size is 2.27 and the average family size is 3.14.
In the city, the population is spread out with 22.0% under the age of 18, 10.7% from 18 to 24, 36.1% from 25 to 44, 20.0% from 45 to 64, and 11.3% who are 65 years of age or older. The median age is 33 years. For every 100 females there are 102.1 males.
The median income for a household in the city is $41,767, and the median income for a family is $48,195. Males have a median income of $36,232 versus $33,768 for females. The per capita income for the city is $24,101. 14.3% of the population and 10.6% of families are below the poverty line. Out of the total population, 20.3% of those under the age of 18 and 9.7% of those 65 and older are living below the poverty line.
Most of Denver has a straightforward street grid oriented to the four cardinal directions. Blocks are usually identified in hundreds from the median streets, identified as "00", which are Broadway (the east–west median, running north–south) and Ellsworth Avenue (the north–south median, running east–west). Colfax Avenue, the major east-west artery through Denver, is 15 blocks (1500) north of the median. Avenues north of Ellsworth are numbered (with the exception of Colfax Avenue and a few others), while avenues south of Ellsworth are named.
There is also an older downtown grid system that was designed to be parallel to the confluence of the South Platte River and Cherry Creek. Most of the streets downtown and in LoDo run northeast-southwest and northwest-southeast. This system has an unplanned benefit for snow removal; if the streets were in a normal N-S/E-W grid, only the N-S streets would receive sunlight. With the grid oriented to the diagonal directions, the NW-SE streets receive sunlight to melt snow in the morning and the NE-SW streets receive it in the afternoon. This idea was from Henry Brown the founder of the Brown Palace Hotel. There is now a plaque across the street from the Brown Palace Hotel which honors this idea. The NW-SE streets are numbered, while the NE-SW streets are named. The named streets start at the intersection of Colfax Avenue and Broadway with the block-long Cheyenne Place. The numbered streets start underneath the Colfax and I-25 viaducts. There are 27 named and 44 numbered streets on this grid. There are also a few vestiges of the old grid system in the normal grid, such as Park Avenue, Morrison Road, and Speer Boulevard. Larimer Street, named after William Larimer, Jr., the founder of Denver, which is located in the heart of LoDo, is the oldest street in Denver.
All roads in the downtown grid system are streets. (16th Street, Stout Street) Roads outside of that system that travel east/west are given the suffix "avenue" and those that head north and south are given the "street" suffix. (Example, Colfax Avenue, Lincoln Street,). Boulevards are higher capacity streets and will travel any direction (more commonly North and South). Smaller roads are sometimes referred to as places, drives or courts. Most streets outside of the area between Broadway and Colorado Boulevard are organized alphabetically from the city's center.
Confusion may arise where the two grid systems meet, especially given downtown Denver's one way streets. The system can be easily navigated with the help of directional signs. The mountains to the west also offer a great compass-point for those attempting to drive in the Mile High City.
Many Denver streets have bicycle lanes, and there are also an abundance of off-road bike paths in Denver parks and along bodies of water, like Cherry Creek and the South Platte. This allows for a significant portion of Denver's population to be bicycle commuters and has led to Denver being known as a bicycle friendly city.
Denver is primarily served by the interstate freeways I-25 and I-70. The intersection of the two interstates is referred to locally as "the mousetrap", because when airborne, the junction (and subsequent vehicles) resemble mice in a large trap.
Denver also has a nearly complete beltway known as "the 470's". These are SH 470 (also known as C-470), a freeway in the southwest Metro area, and two toll highways, E-470 (from southeast to northeast) and Northwest Parkway (from terminus of E-470 to US-36). SH 470 was originally intended to be I-470 and built with federal highway funds, but the funding was redirected to complete downtown Denvers' 16th Street to a pedestrian mall, so construction was delayed until 1980 after state and local legislation was passed.
A highway expansion and transit project for the southern I-25 corridor, dubbed T-REX (Transportation Expansion Project), was completed on November 17, 2006. The project installed wider and additional highway lanes, and improved highway access and drainage. The project also includes a light rail line that traverses from downtown to the south end of the metro area at Lincoln Avenue. The project spanned almost 19 miles (31 km) along the highway with an additional line traveling parallel to part of I-225, stopping just short of Parker Road.
Metro Denver highway conditions can be accessed on the Colorado Department of Transportation website Traffic Conditions.
Mass transportation throughout the Denver-Aurora metropolitan area is managed and coordinated by the Regional Transportation District (RTD). RTD currently operates more than 1,000 buses serving over 10,000 bus stops in 38 municipal jurisdictions in eight counties around the Denver-Aurora and Boulder Metropolitan Areas. Additionally, RTD operates six light rail lines, the C, D, E, F, G,and H with a total of 34.9 miles (56 km) of track, serving 36 stations. FasTracks is a light rail expansion project which was approved by voters in 2004, which would serve neighboring communities.
Amtrak, the national passenger rail system, provides service to Denver, operating its California Zephyr daily in both directions between Chicago and Emeryville, California, across the bay from San Francisco. Amtrak Thruway service operated by private bus companies links the Denver station with Rocky Mountain points.
At Albuquerque, New Mexico, Denver Thruway connections are made daily with the Amtrak Southwest Chief. Additionally, there is the Ski Train operated on the former Denver & Rio Grande Western Railroad, which takes passengers between Denver and the Winter Park Ski Resort.
Denver's early years as a major train hub of the west are still very visible today. Trains stop in Denver at historic Union Station, where travelers can access RTD's 16th Street Free MallRide or use light rail to tour the city. Union Station will also serve as the main juncture for rail travel in the metro area, at the completion of FasTracks.
Denver International Airport (IATA: DEN, ICAO: KDEN), commonly known as DIA, serves as the primary airport for a large region surrounding Denver. DIA is located 18.6 miles (30 km) east-northeast of the Colorado State Capitol. DIA is the tenth busiest airport in the world and ranks fourth in the United States, with 51,245,334 passengers passing through it in 2008. It covers more than 53 square miles (137 km²), making it the largest airport by land area in the United States and larger than the island of Manhattan. Denver serves as a major hub for United Airlines and the headquarters for Frontier Airlines.
Three general aviation airports serve the Denver area. Rocky Mountain Metropolitan Airport (KBJC) is 13.7 miles (22 km) north-northwest, Centennial Airport (KAPA) is 13.7 miles (22 km) south-southeast, and Front Range Airport (KFTG) is located 23.7 miles (38 km) east of the state capitol.
In the past, Denver has been home to several other airports that are no longer operational. Stapleton International Airport was closed in 1995 when it was replaced by DIA. Lowry Air Force Base was a military flight training facility that ceased flight operations in 1966, with the base finally being closed in 1994. It is currently being used for residential purposes. Buckley Air Force Base, a former Air National Guard base is currently the only military facility in the Denver-Metro area.