It is a Home Rule Municipality situated in Arapahoe County, Colorado, USA. It is a piece of the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area. Centennial is the tenth most crowded region in the territory of Colorado and its 2001 city joining was the biggest in U.S. history. Centennial is positioned as the fifteenth most secure city in the nation.
The City of Centennial was shaped on seven February, 2001, from segments of unincorporated Arapahoe County, including the previous Castlewood and Southglenn enumeration assigned spots . The residents of the territory had voted to consolidate on September 12, 2000, picking Centennial as the official name amid the vote.