The United States Census Bureau estimates that the population of Tennessee was 6,715,984 on July 1, 2017, an increase of 369,689 people since the 2010 United States Census, or 5.8%. This includes a natural increase since the last census of 124,385 people (that is 584,236 births minus 459,851 deaths), and an increase from net migration of 244,537 people into the state. Immigration to the United States from outside the United States resulted in a net increase of 66,412 people, and migration within the country produced a net increase of 178,125 people.. How many years did it take to increase the population of Tennessee by 369,689?