Omaha is the largest city in the state of Nebraska, United States, and is the county seat of Douglas County. It is located in the Midwestern United States on the Missouri River. Omaha is the home to the headquarters of five Fortune 500 companies. New construction has occurred throughout the city since the start of the 21st century. Important retail and office developments have occurred in West Omaha such as the Village Pointe shopping center and several business parks. The Old Market in Downtown Omaha is one of the major attractions and is important to the city's retail economy.