Horizon Bay in San Marcos, Texas, is located in beautiful Hill Country near the San Marcos River. Our apartment-style community offers all of the amenities of home without the work. Imagine a life without household chores, yard work, or home maintenance. Invite guests to a meal, special event, or social outing. With our on-site Resident Program Director, scheduled transportation, and dining program - there are opportunities to make new friends or entertain old ones right outside your front door.