Oklahoma City is the capital and largest city of the U.S. state of Oklahoma. The county seat of Oklahoma County, the city ranks 31st among United States cities in population. The city's estimated population as of 2006 was 537,734, with a 2007 estimated population of 1,192,989 in the metropolitan area. In 2007, the Oklahoma City-Shawnee Combined Statistical Area had a population of 1,262,027 residents.
Besides Oklahoma County, the sprawling city extends into Canadian, Cleveland, and Pottawatomie counties. It was founded during the Land Run of 1889.In 1995, the Alfred P. Murrah Federal Building in Oklahoma City was bombed by a disaffected U.S. Army veteran. With the Oklahoma City bombing resulting in 168 deaths, Timothy McVeigh caused the most destructive act of domestic terrorism in United States history, and the most destructive act of terrorism on American soil prior to the September 11, 2001 attacks.