| RCRafael Carillo | Fontana | CA | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| RSRed Star Logistics, Inc. | Fontana | CA | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| RBRichard Brahier dba R&K CUSTOM CYCLES AND HOT ROD CITY | Fontana | CA | Transportation Equipment Manufacturing336991 | — | ◇ UNVERIFIED |
| RWRj Welding | Fontana | CA | Machinery Manufacturing333415 | — | ◇ UNVERIFIED |
| RSRoad Systems INC | Fontana | CA | Transportation Equipment Manufacturing336212 | — | ◇ UNVERIFIED |
| RERoca Engineering Inc. | Fontana | CA | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| RCRodolfo Cortes | Fontana | CA | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| RERogers Exhaust Shop | Fontana | CA | Beverage and Tobacco Product Manufacturing312230 | — | ◇ UNVERIFIED |
| SGSan Gabriel Valley Lumber & Milling CO INC | Fontana | CA | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
 Schlosser Forge Company Rancho Plant #2 | Fontana | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| SCSchutz Container Systems INC | Fontana | CA | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| SPShawcor Pipe Protection LLC. | Fontana | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| SASierra Aluminum Architectural | Fontana | CA | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| SASierra Aluminum CO | Fontana | CA | Furniture and Related Product Manufacturing337215 | — | ◇ UNVERIFIED |
| SASierra Aluninum Fontana Extrusion Operation | Fontana | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| SSSimpson Sandblasting & Special Coatings, INC | Fontana | CA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| SJSocal Jcb | Fontana | CA | Transportation Equipment Manufacturing336510 | — | ◇ UNVERIFIED |
| SCSouthern California Screen Pri | Fontana | CA | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| SMSouthwest Medical Resources LLC | Fontana | CA | Computer and Electronic Product Manufacturing334510 | — | ◇ UNVERIFIED |
| SSSpeedway Sbc Development, LLC | Fontana | CA | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| SGSunkist Growers INC | Fontana | CA | Food Manufacturing311421 | — | ◇ UNVERIFIED |
| SLSuperior Lawn Mower Center INC | Fontana | CA | Machinery Manufacturing333112 | — | ◇ UNVERIFIED |
| SSSuperior Sandblasting & Coatings | Fontana | CA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| STSuperior Trailer Work | Fontana | CA | Machinery Manufacturing333924 | — | ◇ UNVERIFIED |
| STSupreme Truck Bodies of Cal | Fontana | CA | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| TITandem Industries | Fontana | CA | Computer and Electronic Product Manufacturing334111 | — | ◇ UNVERIFIED |
| TOTec of California | Fontana | CA | Transportation Equipment Manufacturing336992 | — | ◇ UNVERIFIED |
| TOTec of California INC | Fontana | CA | Machinery Manufacturing333924 | — | ◇ UNVERIFIED |
| TCThe Coca Cola Company-fontana | Fontana | CA | Beverage and Tobacco Product Manufacturing312112 | — | ◇ UNVERIFIED |
| TWThe Water Zen LLC | Fontana | CA | Beverage and Tobacco Product Manufacturing312112 | — | ◇ UNVERIFIED |
| TITreasure Islands Manufacturing | Fontana | CA | Electrical Equipment, Appliance & Component Manufacturing335221 | — | ◇ UNVERIFIED |
| TSTreon Steel Fabricators INC | Fontana | CA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| TWTrepco West | Fontana | CA | Beverage and Tobacco Product Manufacturing312230 | — | ◇ UNVERIFIED |
| TPTurret Punch CO INC | Fontana | CA | Chemical Manufacturing325212 | — | ◇ UNVERIFIED |
| TPTurret Punch CO Inc/tpc INC | Fontana | CA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| TPTutor Perini Corporation Equipment Yard | Fontana | CA | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| UMUS Mix | Fontana | CA | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| UPUS Pipe Fabrication | Fontana | CA | Fabricated Metal Product Manufacturing332996 | — | ◇ UNVERIFIED |
| USU S Reduction CO | Fontana | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| UCUtility Crane and Equipment INC | Fontana | CA | Transportation Equipment Manufacturing336992 | — | ◇ UNVERIFIED |
| WIWadco Ind INC | Fontana | CA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| WCWest Coast Liquidators | Fontana | CA | Textile Mills313310 | — | ◇ UNVERIFIED |
| WWWood World Custom Design | Fontana | CA | Wood Product Manufacturing321211 | — | ◇ UNVERIFIED |
| WAWorthington Armstrong Venture | Fontana | CA | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| ZMZo Motors North America LLC | Fontana | CA | Transportation Equipment Manufacturing336992 | — | ◇ UNVERIFIED |
