  killeen is a city in bell county, texas, united states. according to the 2010 united states census, the city's population was 127,921, making it the 21st most populous city in texas. it is the "principal city" of the killeen&ndash;temple&ndash;fort hood [[killeen â
1872_establishments_in_Texas Cities_in_Bell_County,_Texas Cities_in_Texas Killeen_a_Temple_a_Fort_Hood_metropolitan_area Populated_places_established_in_1872