| RCRaytheon Company | San Diego | CA | Computer and Electronic Product Manufacturing334519 | — | ◇ UNVERIFIED |
| RBRcp Block & Brick INC | San Diego | CA | Nonmetallic Mineral Product Manufacturing327331 | — | ◇ UNVERIFIED |
| RMRdl Machine INC Dba Hall Machine | San Diego | CA | Electrical Equipment, Appliance & Component Manufacturing335222 | — | ◇ UNVERIFIED |
| RAReagents Applications INC | San Diego | CA | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| RRealterm | San Diego | CA | Beverage and Tobacco Product Manufacturing312111 | — | ◇ UNVERIFIED |
| RRRecon Rf INC | San Diego | CA | Computer and Electronic Product Manufacturing334515 | — | ◇ UNVERIFIED |
| RIRedoxblox INC | San Diego | CA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| RPReel Picture Productions, LP Dba Reel Picture LLC | San Diego | CA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| RCReid & Clark Screen Arts CO | San Diego | CA | Printing and Related Support Activities323119 | — | ◇ UNVERIFIED |
| RTRemac Tire Services | San Diego | CA | Plastics and Rubber Products Manufacturing326212 | — | ◇ UNVERIFIED |
| RHRemedy Holistic Pharmacy INC Remedy | San Diego | CA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| RPRemedy Processors | San Diego | CA | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| RPRemedy Processors LLC Dba Remedy | San Diego | CA | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| RORemote Ocean Systems INC | San Diego | CA | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| RDResearch & Development District (radd) - Block 1a | San Diego | CA | Transportation Equipment Manufacturing336350 | — | ◇ UNVERIFIED |
| RCResin Craft INC Dba Lamination San Diego | San Diego | CA | Miscellaneous Manufacturing339920 | — | ◇ UNVERIFIED |
| RLResonetics LLC | San Diego | CA | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| RSRespivant Sciences INC | San Diego | CA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| RIRf Industries | San Diego | CA | Computer and Electronic Product Manufacturing334290 | — | ◇ UNVERIFIED |
| RPR&h Properties LP | San Diego | CA | Transportation Equipment Manufacturing336350 | — | ◇ UNVERIFIED |
| RGRichard Greenfield, M.d. | San Diego | CA | Chemical Manufacturing325992 | — | ◇ UNVERIFIED |
| RCRich C. Soergel Living Trust | San Diego | CA | Apparel Manufacturing315990 | — | ◇ UNVERIFIED |
| RMRight Manufacturing, LLC | San Diego, | CA | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| RIRimar INC | San Diego | CA | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| RERincon Engineering Technologies | San Diego | CA | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| RURise Up Industries | San Diego | CA | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| RMRj Machine INC | San Diego | CA | Fabricated Metal Product Manufacturing332721 | — | ◇ UNVERIFIED |
| RIRls (usa) INC | San Diego | CA | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| RIRobanda International, Inc. | San Diego | CA | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
| RRRobertson's Ready Mix | San Diego | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| RWRock West Composites | San Diego | CA | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| RHRoderick Hamby | San Diego | CA | Furniture and Related Product Manufacturing337127 | — | ◇ UNVERIFIED |
| RIRohr INC Brown Field | San Diego | CA | Transportation Equipment Manufacturing336413 | — | ◇ UNVERIFIED |
| RCRoman Catholic Diocese San Diego | San Diego | CA | Petroleum and Coal Products Manufacturing324199 | — | ◇ UNVERIFIED |
| RERosendin Electric | San Diego | CA | Food Manufacturing311224 | — | ◇ UNVERIFIED |
| RBRosewell Biotechnologies INC | San Diego | CA | Computer and Electronic Product Manufacturing334516 | — | ◇ UNVERIFIED |
| RRRostam Reifschneider | San Diego | CA | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| RIRubies Ii, LLC | San Diego | CA | Miscellaneous Manufacturing339930 | — | ◇ UNVERIFIED |
| RPRush Press INC | San Diego | CA | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| SISabia, Incorporated | San Diego | CA | Computer and Electronic Product Manufacturing334513 | — | ◇ UNVERIFIED |
| SISabia, Incorporated | San Diego | CA | Computer and Electronic Product Manufacturing334413 | — | ◇ UNVERIFIED |
| SRSadie Rose Baking Co. | San Diego | CA | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| SASage Analytical Lab LLC | San Diego | CA | Computer and Electronic Product Manufacturing334413 | — | ◇ UNVERIFIED |
| SSSage Scientific LLC Dba Neurophotometrics LLC | San Diego | CA | Computer and Electronic Product Manufacturing334517 | — | ◇ UNVERIFIED |
| STSamperio Turbo Sd | San Diego | CA | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| SSSamsung Semiconductor INC | San Diego | CA | Computer and Electronic Product Manufacturing334413 | — | ◇ UNVERIFIED |
| SDSan Diego 2 LLC | San Diego | CA | Miscellaneous Manufacturing339930 | — | ◇ UNVERIFIED |
| SDSan Diego / Cell Based Meat Lab / Aes | San Diego | CA | Chemical Manufacturing325414 | — | ◇ UNVERIFIED |
| SDSan Diego County District Attorney's Office | San Diego | CA | Computer and Electronic Product Manufacturing334412 | — | ◇ UNVERIFIED |
| SDSan Diego Elevator CO. | San Diego | CA | Machinery Manufacturing333999 | — | ◇ UNVERIFIED |
