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is a Home Rule City located in Arapahoe County, Colorado, United States. The city was estimated to have a total population of 98,243 in 2005. Centennial is the tenth most populous city in the State of Colorado.
Centennial was incorporated from portions of unincorporated Arapahoe County in 2001. The city was incorporated to prevent the City of Greenwood Village from annexing certain portions of Arapahoe County to improve its tax base. The money generated from those businesses in the unincorporated portion of Arapahoe County funded the majority of the county's services, including road work. There were a number of court cases establishing the right of incorporation to take precedence over the right of annexation. Located entirely within Arapahoe County, and forming part of the Denver Metropolitan Area, Centennial was formed February 7, 2001 (the day after its first city officials were elected). The citizens of the formerly unincorporated portion of Arapahoe County had voted to incorporate on September 12, 2000, choosing Centennial as the official name during the vote. It was created on a promise to keep city taxes at 1% (one of the campaigns against incorporation appealed to maintain the unincorporated 3.8% sales tax). According to the City of Centennial website, the current sales tax rate is two and one-half times the promise, at 2.5%. Incorporation was approved by 77% of the voters, and the 100,000+ person population of the area made it the largest incorporation in U.S. history as of its creation.
The City recently held a home-rule charter convention, where a new charter was adopted. The new charter was approved by voters on June 10, 2008 by a margin of 2-to-1 .
Centennial Airport, formerly Arapahoe County Airport, lies adjacent to, but outside of the city limits; it is not named after the city, as it predates it by over 30 years.