Cookeville is a city in Putnam County, Tennessee, United States. The population was 23,923 at the 2000 census. The 2010 Census of Cookeville's population was 30,435, and the combined total of those living in Cookeville's ZIP codes in 2010 was 65,014. It is the county seat of Putnam County and home to Tennessee Technological University. It is recognized as one of the country's micropolitan areas, smaller cities which nevertheless function as significant economic hubs.