Omaha is a metro area of nearly one million people straddling the Missouri River on the Nebraska-Iowa border. The city punches well above its weight in corporate headquarters: Berkshire Hathaway, Mutual of Omaha, Union Pacific Railroad, ConAgra, TD Ameritrade (now part of Charles Schwab), and Gallup all call Omaha home. The Henry Doorly Zoo is consistently ranked among the best in the world and is the state's top tourist attraction. Neighborhoods offer remarkable variety — the Old Market downtown is the walkable dining and entertainment hub, Dundee and Benson are trendy older neighborhoods with local restaurants and bars, Aksarben Village is a mixed-use redevelopment success story, and West Omaha along the 168th and 192nd Street corridors features the newest suburban growth. Offutt Air Force Base in neighboring Bellevue is the region's largest single employer and drives a steady cycle of military moves. The University of Nebraska at Omaha and Creighton University add academic and cultural anchors. Omaha Public Schools is the state's largest district, though many families choose the Millard or Westside Community School districts for their strong reputations. The cost of living is notably low — Omaha regularly appears on "most affordable cities" lists — and the housing market offers everything from Victorian mansions in the Gold Coast to modern suburban construction in Elkhorn. Interstate 80 connects the metro east-west, while I-680 and the Kennedy Freeway serve commuters.