Indianapolis 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 798,382 in 2008. 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), and the second most populous state capital (behind Phoenix, Arizona). It is one of two state capitals that shares its name with its state (The other is Oklahoma City)