Billings is the largest city in the U.S. state of Montana, and the principal city of the Billings Metropolitan Area with a population of 183,780. It has a trade area of over half a million people. Billings is located in the south-central portion of the state and is the seat of Yellowstone County, which had a 2018 population of 173,372. The 2018 Census estimates put the Billings population at 111,150, making it the only city in Montana with over 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, an eastern suburb of the city, saw growth of 57.8%, the largest growth rate of any community in Montana. Billings has avoided the economic downturn that affected most of the nation 2008–2012 as well as avoiding the housing bust. With the Bakken oil development in eastern Montana and western North Dakota, the largest oil discovery in U.S. history, as well as the Heath shale oil discovery just north of Billings, the city's growth rate stayed high during the shale oil boom. Although the city is still growing, the rate of increase has diminished markedly with oil price declines in recent years.