| Units |
| National Historical Parks | Lyndon B. Johnson |
| Palo Alto Battlefield | |
| San Antonio Missions | |
| National Historic Sites | Fort Davis |
| National Memorials | Chazimal |
| National Monuments | Alibates Flint Quarries |
| Waco Mammoth | |
| National Seashores | Padre Island |
| National Parks | Big Bend |
| Guadalupe Mountains | |
| National Preserves | Big Thicket |
| National Recreation Areas | Amistad |
| Lake Meredith | |
| Wild & Scenic Rivers | Rio Grande |
| Non-Units |
| National Historic Trails | Butterfield Overland (Multi-State) |
| El Camino Real De Los Tejas (Multi-State) |