Putnam County is a county located in the U.S. state of Tennessee. As of the 2020 census, the population was 79,854. Its county seat is Cookeville. Putnam County is part of the Cookeville, TN Micropolitan Statistical Area.

Cookeville is the county seat and largest city of Putnam County, Tennessee, United States. As of the 2020 United States census, its population was reported to be 34,842. It is recognized as one of the country's micropolitan areas, or smaller cities which function as significant regional economic hubs. Of the twenty micropolitan areas in Tennessee, Cookeville is the largest. The Cookeville micropolitan area's 2020 Census population was 141,333. The U.S. Census Bureau ranked the Cookeville micropolitan area as the 4th largest-gaining micropolitan area in the country between 2022 and 2023, with a one-year gain of 2,748 and a 2023 population of 148,226. The city is a college town, home to Tennessee Technological University.