Population growth since 1990 has been concentrated in the counties surrounding Indianapolis, with four of the five fastest-growing counties in that area: Hamilton, Hendricks, Johnson, and Hancock. The other county is Dearborn County, which is near Cincinnati, Ohio. Hamilton County has also grown faster than any county in the states bordering Indiana (Illinois, Michigan, Ohio and Kentucky), and is the 20th-fastest growing county in the country.
With a population of 829,817, Indianapolis is the largest city in Indiana and the 12th-largest in the United States, according to the 2010 Census. Three other cities in Indiana have a population greater than 100,000: Fort Wayne (253,617), Evansville (117,429) and South Bend (101,168). Since 2000, Fishers has seen the largest population rise amongst the state's 20 largest cities with an increase of 100 percent.
Gary and Hammond have seen the largest population declines regarding the top 20 largest cities since 2000, with a decrease of 21.0 and 6.8 percent respectively. Other cities that have seen extensive growth since 2000 are Noblesville (39.4 percent), Greenwood (81 percent), Carmel (21.4 percent) and Lawrence (9.3 percent). Meanwhile, Evansville (−4.2 percent), Anderson (−4 percent) and Muncie (−3.9 percent) are cities that have seen the steepest decline in population in the state.
Indianapolis has the largest population of the state's metropolitan areas and the 33rd-largest in the country. The Indianapolis metropolitan area encompasses Marion County and nine surrounding counties in central Indiana.