City of Marietta 205 Lawrence Street, Fourth Floor, Marietta, GA 30060, 770-794-5509, Provides information on local city services and local government offices in the Marietta area. more... 

Cobb Chamber of Commerce 398 Main Street, Marietta, GA 30060, 770-980-2000, Promotes and supports local businesses and industries in the Marietta and Cobb County areas plus provides relocation information. 

Marietta Business Association P.O. Box 2152, Marietta, GA 30060, Located in Downtown Marietta, 770-429-1115, 800-835-0445, This association is dedicated to promoting the commercial and economic welfare and goals of the businesses of Marietta. more...

Marietta Welcome Center & Visitors Bureau 4 Depot Street, Marietta, GA 30060, 770-429-1115, Located in an 1898 train depot, this visitor's bureau offers information on local lodging, dining, shopping, events, and attractions in the Marietta area. more...