| Business | Phone |
| Big Spring Camp Ground Station Van Buren 63965 | (573) 323-4500 |
| Big Spring Maintenance Shop Hc 1 Box 168, Van Buren 63965 | (573) 323-8291 |
| Big Spring Ranger Station Van Buren 63965 | (573) 323-8194 |
| Big Spring Water Lab Van Buren 63965 | (573) 323-4733 |