Zynga's Headquarters and Corporate office are located in the US. The address is below:
Zynga Corporate HQ:
365 Vermont Street
San Francisco, CA 94103
Zynga is famous for social networking games and smartphone games. They let users play with their friends across social networks, mostly Facebook.
Zynga.com offers game forums and support online. Zynga's customer service phone number is 1-800-762-2530.