Indianapolis (pronounced /ˌɪndiəˈnæpəlɨs/), often abbreviated Indy (/ˈɪndi/), is the capital of the U.S. state of Indiana, and the county seat of Marion County, Indiana. The United States Census estimated the city's population, excluding the included towns, at 807,584 in 2009. It is Indiana's largest city and is the 14th largest city in the U.S., the third largest city in the Midwest (behind Chicago and Detroit), the second most populous state capital (after Phoenix, Arizona), and the most populous state capital east of the Mississippi River. Indianapolis is also the fastest growing region in the Midwest.For much of its history, Indianapolis has oriented itself around government and industry, particularly manufacturing. Today, Indianapolis has a much more diversified economy, contributing to the fields of education, health care, and finance. Tourism is also a vital part of the economy of Indianapolis, and the city plays host to numerous conventions and sporting events. Of these, perhaps the most well known is the annual Indianapolis 500. Other major sporting events include the Brickyard 400 and the Men's and Women's NCAA Basketball Tournaments.Greater Indianapolis has seen moderate growth among U.S. cities, The population of the metropolitan statistical area is estimated at 1,715,459, making it the 33rd-largest in the U.S. The combined statistical area population of Indianapolis is 2,035,327, the 23rd-largest in the U.S.