Cookeville is a city in Putnam County, Tennessee, United States. The population was 23,923 at the 2000 census. The 2009 Census estimate of Cookeville's population is 29,880, and the combined total of those living in Cookeville's ZIP codes in 2000 is 55,448. 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 towns which nevertheless function as significant economic hubs. Of the twenty micropolitan areas in Tennessee, Cookeville is the largest; the Cookeville micropolitan area's 2009 Census estimate population is 104,366.