Albuquerque is the largest city in the state of New Mexico, United States. It is the county seat of Bernalillo County and is situated in the central part of the state, straddling the Rio Grande. The city population was 523,590 as of July 1, 2007 U.S. census. With a metropolitan population of 841,133 as of July 1, 2007. In 2007, Albuquerque ranked as the 32nd-largest city as well as the 2nd fastest growing city in the country. Albuquerque has the 59th-largest metropolitan area in the U.S. The Albuquerque MSA population includes the city of Rio Rancho, one of the fastest growing cities in the United States, a hub for many master-planned communities which are expected to draw future businesses and residents to the area. Albuquerque is located at 35° 6' 39" N, 106° 36' 36" W.

Albuquerque is home to the University of New Mexico (UNM) and Kirtland Air Force Base as well as Sandia National Laboratories and Petroglyph National Monument. The Sandia Mountains run along the eastern side of Albuquerque and the Rio Grande flows through the city north to south.

The city was founded in 1706 as the Spanish colonial outpost of Ranchos de Alburquerque; present-day Albuquerque retains much of the Spanish cultural and historical heritage.

Alburquerque was a farming community and strategically located military outpost along the Camino Real. The town of Alburquerque was built in the traditional Spanish village pattern: a central plaza surrounded by government buildings, homes, and a church. This central plaza area has been preserved and is open to the public as a museum, cultural area, and center of commerce. It is referred to as "Old Town Albuquerque" or simply "Old Town." "Old Town" was also sometimes referred to as "La Placita" ("little plaza" in Spanish).

The village was named by the provincial governor Don Francisco Cuervo y Valdes in honour of Don Francisco Fernández de la Cueva, Duke of Alburquerque, viceroy of New Spain from 1653 to 1660. The first "r" in "Alburquerque" was dropped at some point in the 19th century, supposedly by an Anglo-American railroad station-master unable to correctly pronounce the city's name. Some New Mexicans still prefer the spelling Alburquerque; see for example the book by that name by Rudolfo Anaya. In the 1990s, the Central Avenue Trolley Buses were emblazoned with the name Alburquerque (with two "r"s) in honor of the city's historic name.

The Alburquerque family name dates from pre-12th century Iberia (Spain and Portugal) and is habitational in nature (de Alburquerque = from Alburquerque). The Spanish village of Alburquerque is within the Badajoz province of Spain, and located just fifteen miles from the Portuguese border. Cork trees dominate the landscape and Alburquerque is a center of the Spanish cork industry. Over the years, this region has been alternately under both Spanish and Portuguese rule. (It is interesting to note that the Portuguese spelling has only one 'r'). Historically, the land around Alburquerque was invaded and settled by the Moors (711 AD) and the Romans (218 BC) before them. Thus, the word Alburquerque may be rooted in the Arabic (Moorish) 'Abu al-Qurq', which means "father of the cork oak," or "land of the cork oak" (the land as father - fatherland). Alternately, it may be Latin (Roman) in origin and from 'albus quercus' or "white oak" (the wood of the cork oak is white after the bark has been removed). The seal of the Spanish village of Alburquerque is comprised of a white oak tree, framed by a shield, topped by a crown.

During the Civil War Albuquerque was occupied in February 1862 by Confederate troops under General Henry Hopkins Sibley, who soon afterwards advanced with his main body into northern New Mexico. During his retreat from Union troops into Texas he made a stand on April 8, 1862 at Albuquerque. A day-long engagement at long range led to few casualties against a detachment of Union soldiers commanded by Colonel Edward R. S. Canby.

When the Atchison, Topeka and Santa Fe Railroad arrived in 1880, it bypassed the Plaza, locating the passenger depot and railyards about 2 miles (3 km) east in what quickly became known as New Albuquerque or New Town. Old Town remained a separate community until the 1920s when it was absorbed by the City of Albuquerque, which had been incorporated in 1891. Albuquerque High School, the city's first public high school, was established in 1879.

New Albuquerque quickly became a tidy southwestern town which by 1900 boasted a population of 8,000 inhabitants and all the modern amenities including an electric street railway connecting Old Town, New Town, and the recently established UNM campus on the East Mesa. In 1902 the famous Alvarado Hotel was built adjacent to the new passenger depot and remained a symbol of the city until it was torn down in 1970 to make room for a parking lot. In 2002, the Alvarado Transportation Center was built on the site in a manner resembling the old landmark. The large metro station functions as the downtown headquarters for the city's transit department, and serves as an intermodal hub for local buses, Greyhound buses, Amtrak passenger trains, and the Rail Runner commuter rail line.

New Mexico's dry climate brought many tuberculosis patients to the city in search of a cure during the early 1900s, and several sanitaria sprang up on the West Mesa to serve them. Presbyterian Hospital and St. Joseph Hospital, two of the largest hospitals in the Southwest, had their beginnings during this period. Influential New Deal-era governor Clyde Tingley and famed southwestern architect John Gaw Meem were among those brought to New Mexico by tuberculosis.

The first travelers on Route 66 appeared in Albuquerque in 1926, and before long dozens of motels, restaurants, and gift shops had sprung up along the roadside to serve them. Route 66 originally ran through the city on a north-south alignment along Fourth Street, but in 1937 it was realigned along Central Avenue, a more direct east-west route. The intersection of Fourth and Central downtown was the principal crossroads of the city for decades. The majority of the surviving structures from the Route 66 era are on Central, though there are also some on Fourth. Signs between Bernalillo and Los Lunas along the old route now have brown, historical highway markers denoting it as Pre-1937 Route 66.

The establishment of Kirtland Air Force Base in 1939, Sandia Base in the early 1940s, and Sandia National Laboratories in 1949, would make Albuquerque a key player of the Atomic Age. Meanwhile, the city continued to expand outward onto the West Mesa, reaching a population of 201,189 by 1960. In 1990 it was 384,736 and in 2007 it was 523,590.

Albuquerque's downtown entered the same phase and development (decline, "urban renewal" with continued decline, and gentrification) as nearly every city across the United States. As Albuquerque spread outward, the downtown area fell into a decline. Many historic buildings were razed in the 1960s and 1970s to make way for new plazas, high-rises, and parking lots as part of the city's urban renewal phase. Only recently has downtown come to regain much of its urban character, mainly through the construction of many new loft apartment buildings and the renovation of historic structures like the KiMo Theater, in the gentrification phase.

During the 21st century, the Albuquerque population has continued to grow rapidly. The population of the city proper is estimated at 504,949 in 2006 and the last count by the city was 523,590 in 2007, up from 448,607 in the 2000 census. The metropolitan area population is estimated at 816,811 in 2006, up from 712,738 in the 2000 census.

During 2005 and 2006, the city celebrated its tricentennial with a diverse program of cultural events.