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Killeen is a city in Bell County, Texas, United States. According to the 2020 census, its population was 153,095, making it the 17th-most populous city in Texas and the largest of the three principal cities of Bell County. It is the principal city of the Killeen–Temple–Fort Cavazos Metropolitan Statistical Area. Killeen is 55 mi north of Austin, 125 mi southwest of Dallas, and 125 mi northeast of San Antonio.