Billings is the most populous city in the U.S. state of Montana. The population was 117,116 at the 2020 census, while the Billings metropolitan area has an estimated 193,000 people. Located in the south-central portion of the state, it is the county seat of Yellowstone County. Billings is the trade and distribution center for much of Montana east of the Continental Divide and has one of the largest trade areas in the United States. It is also the largest retail destination for much of the same area. The Billings Chamber of Commerce claims the area of commerce covers more than 125,000 square miles (320,000 km2).