| Business | Phone |
| C & L Enterprise 12400 Loma Rica Dr # 11, Grass Valley 95945 | (530) 274-1811 |
| Electronic Carbide Process 12757 Loma Rica Dr, Grass Valley 95945 | (530) 272-6154 |
| Pacific Numeric Industries 13025 Grass Valley Ave # 9, Grass Valley 95945 | (530) 272-3047 |
| Sierra Swiss & Machine 13242 Grass Valley Ave # 22, Grass Valley 95945 | (530) 272-6137 |
| Venezia Manufacturing Co Inc 345 Crown Point Cir # 800, Grass Valley 95945 | (530) 274-9675 |
| Acuturn Machining 12096 Charles Dr # 2, Grass Valley 95945 | (530) 274-3414 |
| Al's Machine Shop 18925 Dotties Pl, Grass Valley 95949 | (530) 268-0147 |
| Bear's Machining 13058 Greenhorn Rd, Grass Valley 95945 | (530) 477-7310 |
| D & N Precision 13355 Grass Valley Ave, Grass Valley 95945 | (530) 274-1300 |
| Datum 13241 Grass Valley Ave, Grass Valley 95945 | (530) 272-8415 |
| Den Tech Machining 12150 Charles Dr # 2, Grass Valley 95945 | (530) 274-7706 |
| Family Machine & Engineering 13340 Grass Valley Ave # D, Grass Valley 95945 | (530) 277-1511 |
| Herrmann Machine 11678 Otting Ct, Grass Valley 95945 | (530) 274-8999 |
| Impulse Engineering 12731 Loma Rica Dr, Grass Valley 95945 | (530) 273-8807 |
| Rap Sheet Metal 110 Spring Hill Dr, Grass Valley 95945 | (530) 273-7970 |
| Sjs Precision Machining 13321 Grass Valley Ave, Grass Valley 95945 | (530) 274-2698 |
| Titan Engineering 22836 Industrial Pl, Grass Valley 95949 | (530) 268-0101 |
| Valley Machine Co 23121 Blue Heron Rd, Grass Valley 95949 | (530) 268-6572 |