Millington is a city in Shelby County, Tennessee, United States. As of the 2010 census, it had a population of 10,176. Millington is the home of the Memphis International Raceway. It was granted the title "Flag City Tennessee" by the Tennessee State Legislature. The Naval Support Activity Mid-South is located at the former Memphis Naval Air Station, which was downsized in 1993. There is also now a civilian general aviation airport for jets and propeller-driven airplanes at the site.