Choose your preferred location. 699 Church Street Suite 300, Marietta, GA 30060. 770-233-7019. 100 Stone Forest Dr. Suite 150, Woodstock, GA 30189. 678-293-4391. The Providers and Staff of OB/GYN Associates, as always, are committed to providing our patients with the safest and best care possible during this COVID 19 Pandemic..