| Business | Phone |
| Butler Consulting Corp 14811 Winding Creek Ct, Grass Valley 95949 | (530) 272-0300 |
| Excellence In Business Group 11407 Cedar Ridge Dr, Grass Valley 95945 | (530) 273-1949 |
| Optical Physics Solutions 14608 Lower Colfax Rd, Grass Valley 95945 | (530) 271-7412 |