Mental Health Jax in Jacksonville, FL - Clinic/Center. Health (7 days ago) Mental Health Jax is a mental health clinic (Clinic/center - Adult Mental Health) in Jacksonville, Florida.The current practice location for Mental Health Jax is 8825 Perimeter Park Blvd, Jacksonville, Florida.For appointments, you can reach them via phone at (904) 860-8749.The mailing address for Mental Health Jax is ....