Billings is the largest city in the U.S. state of Montana, and is the principal city of the Billings Metropolitan Area, the largest metropolitan area in over 500 miles (800 km). With a trade area of over half a million people it is the largest metropolitan area between Denver and Calgary and between Sioux Falls, South Dakota, and Spokane, Washington. Billings is located in the south-central portion of the state and is the county seat of Yellowstone County, 2011 population of 150,069. The 2011 Census estimates put the Billings population at 105,636, the only city in Montana to surpass 100,000 people. The city is experiencing rapid growth and a strong economy; it has had and is continuing to have the largest growth of any city in Montana. Parts of the metro area are seeing hyper growth. From 2000 to 2010 Lockwood, a southeastern suburb of the city saw growth of 57.8% the largest growth rate of any community in Montana.
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