HCA Houston Healthcare Mainland, a campus of HCA Houston Healthcare Clear Lake, offers advanced healthcare services from a compassionate team of experts—all close to home. HCA Houston Mainland has served Galveston County since 1952. We are a 222-bed, acute care facility offering a full-range of services for your medical needs. Some of our high-quality services available include: 24/7 emergency care, heart and vascular services, general and minimally invasive surgery, and orthopedic surgery.