Fantastic Deals in Centennial.
The City of Centennial is a Home Rule City located in Arapahoe County, Colorado, United States. The city was estimated to have a total population of 99,680 in 2008. Centennial is the tenth most populous municipality in the State of Colorado and its 2001 incorporation was the largest in U.S. history. Centennial is ranked as the 15th safest and 32nd wealthiest city in the country.