Springfield is the third most populous city in the U.S. state of Missouri and the county seat of Greene County. The city's population was 169,176 at the 2020 census. It is the principal city of the Springfield metropolitan area, which had an estimated population of 487,061 in 2022 and includes the counties of Christian, Dallas, Greene, Polk, and Webster, The city sits on the Springfield Plateau of the Ozarks, which ranges from nearly-level to rolling hills. Springfield is the second-largest urban area in the Ozarks. Springfield's nicknames include "Queen City of the Ozarks" and "The Birthplace of Route 66". The city has been called the "Buckle of the Bible Belt" due to its association with evangelical Christianity. The city is the headquarters for Bass Pro Shops and the adjoining Wonders of Wildlife Museum & Aquarium. It is also home to O'Reilly Auto Parts, which began as a family business with 13 employees in 1957. Springfield is close to Wilson's Creek National Battlefield and is along the national historic Trail of Tears. In 2020, Springfield's largest ethnicities were 87.6% White, 4% Black, and 5% two or more races, placing it among the least diverse cities in the United States. The city is a regional center of medical care, with the two largest hospitals, CoxHealth and Mercy, being the largest employers in the city. Springfield hosts several universities and colleges, including Missouri State University, Drury University, and Evangel University. Springfield is an important regional center for distribution, logistics, and manufacturing.