Middle Valley is a census-designated place (CDP) in Hamilton County, Tennessee, United States.

As of the 2020 United States census, there were 11,695 people, 4,362 households, and 3,413 families residing in the CDP.

As of the census[4] of 2000, there were 11,854 people, 4,294 households, and 3,572 families residing in the CDP.

There were 4,459 housing units at an average density of 367.5 per square mile (141.9/km2).

14.3% of all households were made up of individuals, and 5.3% had someone living alone who was 65 years of age or older.