Las Vegas (Spanish for The Meadows) is the most populous city in the U.S. state of Nevada, the seat of Clark County, and an internationally renowned major resort city for gambling, shopping, fine dining, and entertainment. Las Vegas, which bills itself as The Entertainment Capital of the World, is famous for the number of casino resorts and associated entertainment. A growing retirement and family city, it is the 28th most populous city in the United States with an estimated population by the U.S. Census Bureau of 603,093 as of 2008. The estimated population of the Las Vegas metropolitan area as of 2007, was 1,836,333. Established in 1905, Las Vegas officially became a city in 1911. With the growth that followed, at the close of the century Las Vegas was the most populous American city founded in the 20th century (a distinction held by Chicago in the 19th century). The city's tolerance for various forms of adult entertainment earned it the title of Sin City, and this image has made Las Vegas a popular setting for films and television programs. Outdoor lighting displays are everywhere on the Las Vegas Strip and are seen elsewhere in the city as well. As seen from space, the Las Vegas metropolitan area is the brightest on Earth. The name Las Vegas is often applied to unincorporated areas that surround the city, especially the resort areas on and near the Las Vegas Strip. This 4 mile (6.5-km) stretch of Las Vegas Boulevard is partly in the Las Vegas city limits, but mainly in the unincorporated communities of Paradise and Winchester, and continues partly into unincorporated Enterprise. The primary drivers of the Las Vegas economy have been the confluence of tourism, gaming, and conventions which in turn feed the retail and dining industries. The city serves as world headquarters for the world's two largest Fortune 500 gaming companies, Harrah's Entertainment and MGM Mirage. Several companies involved in the manufacture of electronic gaming machines, such as slot machines, are located in the Las Vegas area. In the 2000s retail and dining have become attractions of their own. Tourism marketing and promotion are handled by the Las Vegas Convention and Visitors Authority, a county wide agency. Its annual Visitors Survey provides detailed information on visitor numbers, spending patterns and resulting revenues. Some technology companies have either relocated to Las Vegas or were created there. For various reasons, the Las Vegas area has had a high concentration of technology companies in electronic gaming and telecommunications industries. Some current technology companies in southern Nevada include Bigelow Aerospace, CommPartners, Datanamics, eVital Communications, Petroglyph, SkywireMedia, Switch Communications, and WorldDoc. Companies that originally were formed in Las Vegas, but have since sold or relocated include Westwood Studios (sold to Electronic Arts), Systems Research & Development (Sold to IBM), Yellowpages.com (Sold to Bellsouth and SBC), and MPower Communications. Constant population growth means that the housing construction industry is vitally important. In 2000 more than 21,000 new homes and 26,000 resale homes were purchased. In early 2005 there were 20 residential development projects of more than 300 acres (1.2 km2) each underway. The major attractions in Las Vegas are the casinos. The most famous hotel casinos are located on Las Vegas Boulevard, better known as the Las Vegas Strip. Many of these hotels are massive, carrying thousands of rooms, with their large adjoining casino areas. There are many hotel casinos in the city's downtown area as well, which was the original focal point of the city's gaming industry in its early days. Several large hotels and casinos are also located somewhat off the Strip but adjacent to it, as well as in the county around the city. Some of the most notable casinos involved in downtown gaming are on the Fremont Street Experience which was granted variances to allow bars to be closer together, similar to the Gaslamp Quarter of San Diego.