Manchester is a city and the county seat of Coffee County, Tennessee, United States. The population was 12,213 at the 2020 census. Manchester is part of the Tullahoma micropolitan area. Since 2002, Manchester has been the host city for the annual Bonnaroo Music Festival. The city's population swells to nearly 100,000 people for the four-day event, for which people travel across the country to camp and enjoy continuous and diverse music.