| Business | Phone |
| Probaris Technologies Inc 35315 Carnoustie Cir, Round Hill 20141 | (540) 338-9313 |
| Pinpoint Engineering Inc Round Hill 20141 | (540) 338-4457 |
| Imagematters Round Hill 20141 | (540) 338-3998 |
| Math Support 35441 Williams Gap Rd, Round Hill 20141 | (540) 554-2847 |