The city of Centennial is a Home Rule City located in Arapahoe County, Colorado, United States, and part of the Denver-Aurora metropolitan area. The city was to have a total population of 100,377 in 2010 census. 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 city in the country. Centennial was formed February 7, 2001, from portions of unincorporated Arapahoe County, including the former Castlewood and Southglenn census-designated places . The citizens of the area... had voted to incorporate on September 12, 2000, choosing Centennial as the official name during the vote. The name reflects Colorado’s admission to the Union as the 38th state in 1876, the centennial year of the United States Declaration of Independence. Incorporation was approved by 77% of the voters, and the population of the area at over 100,000 made it the largest incorporation in U.S. history as of its creation. The city was incorporated in large part to prevent further annexations by the city of Greenwood Village in the I-25 corridor to improve its tax base.
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| County: | Arapahoe County |
| State: | Colorado |
| Country: | United States of America |
| Population: | 100,377 |
| Area: | 27.9 sq. mi. |
| Time zone: | Mountain Time Zone |
| Also known as: | Centennial, Colorado |