The City of Marietta, Georgia, is a full-service municipality distinguished by its unique history, sense of community and modern quality of life. The city has six historic districts, some on the National Register of Historic Places, including Northwest Marietta, Whitlock Avenue, Washington Avenue, and Church-Cherokee Streets. The city's welcome center is located in the historic train depot. Marietta is 15 miles northwest of Atlanta and the Cobb County seat. At 23 square miles, Marietta is one of Georgia's most populous cities, with a population over 55,000. The National Civic League judged Marietta one of the 10 best communities in the nation as a 2006 All-America City, the oldest and most-respected community recognition award in the country.