The City of Centennial is the 10th largest city in Colorado with a population of 102,764 as of July 1, 2015. Centennial ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Colorado. See peer rankings below. The primary coordinate point for Centennial is located at latitude 39.5906 and longitude -104.8691 in Arapahoe County.