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Omaha is also the home to five Fortune 1000 headquarters: Green Plains, Intrado, TD Ameritrade, Valmont Industries, and Werner Enterprises. Berkshire Hathaway is headed by local investor Warren Buffett, one of the wealthiest people in the world, according to a decade's worth of Forbes rankings, some of which have ranked him as high as No. Today, Omaha is the home to the headquarters of four Fortune 500 companies: mega-conglomerate Berkshire Hathaway one of the world's largest construction companies, Kiewit Corporation insurance and financial firm Mutual of Omaha and the United States' largest railroad operator, Union Pacific Corporation. In the 20th century, the Omaha Stockyards, once the world's largest, and its meatpacking plants gained international prominence. Throughout the rest of the 19th century, the transportation and jobbing sectors were important in the city, along with its railroads and breweries. During the 19th century, Omaha's central location in the United States spurred the city to become an important national transportation hub. Omaha introduced this new West to the world in 1898, when it played host to the World's Fair, dubbed the Trans-Mississippi Exposition. The city was founded along the Missouri River, and a crossing called Lone Tree Ferry earned the city its nickname, the "Gateway to the West". Omaha's pioneer period began in 1854, when the city was founded by speculators from neighboring Council Bluffs, Iowa. It is ranked as a global city by the Globalization and World Cities Research Network, which in 2020 gave it "sufficiency" status.
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Approximately 1.5 million people reside within the Greater Omaha area, within a 50 mi (80 km) radius of Downtown Omaha. The Omaha-Council Bluffs-Fremont, NE-IA Combined Statistical Area (CSA) totaled 1,004,771, according to 2020 estimates. The Omaha Metropolitan Area is the 58th-largest in the United States, with a population of 967,604. Omaha is the anchor of the eight-county, bi-state Omaha-Council Bluffs metropolitan area. The nation's 39th-largest city, Omaha's 2020 census population was 486,051. Omaha is in the Midwestern United States on the Missouri River, about 10 miles (15 km) north of the mouth of the Platte River. state of Nebraska and the county seat of Douglas County. Omaha ( / ˈ oʊ m ə h ɑː/ OH-mə-hah) is the largest city in the U.S.