Smyrna is a city in Cobb County, Georgia, United States. It is located northwest of Atlanta, and is in the inner ring of the Atlanta Metropolitan Area. It is included in the Atlanta–Sandy Springs–Alpharetta MSA, which is included in the Atlanta–Athens-Clarke–Sandy Springs CSA. From 2000 to 2012, Smyrna grew by 28%. Historically it is one of the fastest-growing cities in the state, and one of the most densely populated cities in the metropolitan area.