Cookeville is a city in Putnam County, Tennessee, United States. Its population at the 2010 census was 30,435. It is the county seat and largest city 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. Of the twenty micropolitan areas in Tennessee, Cookeville is the largest; the Cookeville micropolitan area's 2010 Census population was 106,042.