Hazleton is a city in Luzerne County, Pennsylvania, United States. The population was 25,340 at the 2010 census. The population of Greater Hazleton was 77,187. Hazleton is the second largest city in Luzerne County and the seventeenth largest city in Pennsylvania. It was incorporated as a borough on January 5, 1857, and as a city on December 4, 1891.