| LTLatex Technology INC. | San Marcos | CA | Plastics and Rubber Products Manufacturing326299 | — | ◇ UNVERIFIED |
| MPMacdermid Printing Solutions | San Marcos | CA | Printing and Related Support Activities323120 | — | ◇ UNVERIFIED |
| MPMar-con Products INC | San Marcos | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SASignet Armorlite INC | San Marcos | CA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| TCTrosak Cabinets INC | San Marcos | CA | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| 6S622 San Marcos | San Marcos | CA | Food Manufacturing311511 | 100-499 | ◐ LIKELY ACTIVE |
| ASAccu-seal Sencorpwhite, INC. | San Marcos | CA | Machinery Manufacturing333993 | — | ▲ REPORTED CLOSED |
| ALAccu-tech Laser Processing, INC. | San Marcos | CA | Computer and Electronic Product Manufacturing334413 | — | ◐ LIKELY ACTIVE |
| ATAvista Technologies Inc | San Marcos | CA | Chemical Manufacturing325998 | 20-99 | ◐ LIKELY ACTIVE |
| CCCarlsbad Coastal Winery | San Marcos | CA | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| CECreative Electron INC. | San Marcos | CA | Computer and Electronic Product Manufacturing334517 | — | ◐ LIKELY ACTIVE |
| CSCulinary Specialties Inc. | San Marcos | CA | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| EWEv West INC. | San Marcos | CA | Transportation Equipment Manufacturing336320 | — | ◐ LIKELY ACTIVE |
| GEGeneral Electronic Devices, INC. | San Marcos | CA | Computer and Electronic Product Manufacturing334419 | — | ◐ LIKELY ACTIVE |
| KMK-tech Machine, INC. | San Marcos | CA | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| LFLa Fleur's Winery | San Marcos | CA | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| MDMACKAY Distillers | San Marcos | CA | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| MMMeadiocrity Mead | San Marcos | CA | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| NENaval Engineering Technology LLC. | San Marcos | CA | Transportation Equipment Manufacturing336611 | 1-19 | ◐ LIKELY ACTIVE |
| OHO'neill Honey Company LLC | San Marcos | CA | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| PSPerfect Soul Whiskey, LLC | San Marcos | CA | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| RCRaging Cider & Mead Co. | San Marcos | CA | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| RCReitz, Charles | San Marcos | CA | Fabricated Metal Product Manufacturing332999 | — | ◐ LIKELY ACTIVE |
| SMSan Marcos | San Marcos | CA | Miscellaneous Manufacturing339113 | 1-19 | ◐ LIKELY ACTIVE |
| TOTwin Oaks Valley Winery | San Marcos | CA | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BIBaked in the Sun Dba House of Tudor | San Marcos | CA | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| BHB & H Tool CO | San Marcos | CA | Machinery Manufacturing333514 | — | ◇ UNVERIFIED |
| 2V237 Via Vera Cruz | San Marcos | CA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| 7W74 Weld, Inc. | San Marcos | CA | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| ACAbba Collision Paint & Body Dba La Mirada Paint and Body Shop | San Marcos | CA | Transportation Equipment Manufacturing336360 | — | ◇ UNVERIFIED |
| ABAbel & Brothers Custom Iron Works | San Marcos | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| AIAeroweld INC | San Marcos | CA | Transportation Equipment Manufacturing336412 | — | ◇ UNVERIFIED |
| AGA & G Industries INC | San Marcos | CA | Machinery Manufacturing333414 | — | ◇ UNVERIFIED |
| ACAll City Storage | San Marcos | CA | Machinery Manufacturing333921 | — | ◇ UNVERIFIED |
| ALAquaneering LLC | San Marcos | CA | Apparel Manufacturing315990 | — | ◇ UNVERIFIED |
| AAAudience AV, Inc. | San Marcos | CA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| BBBestop Baja LLC Dba Baja Designs | San Marcos | CA | Transportation Equipment Manufacturing336321 | — | ◇ UNVERIFIED |
| BFBiodriven Fuel LP | San Marcos | CA | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| BSBoral Stone Products LLC | San Marcos | CA | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| BDBrew Dudes, LLC. | San Marcos | CA | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
| CACalifornia Air Compressor Company | San Marcos | CA | Machinery Manufacturing333912 | — | ◇ UNVERIFIED |
| CCCalifornia Commercial Asphalt LLC | San Marcos | CA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| CSCalifornia Sheet Metal Works INC | San Marcos | CA | Machinery Manufacturing333513 | — | ◇ UNVERIFIED |
| CMCart Mart INC | San Marcos | CA | Transportation Equipment Manufacturing336999 | — | ◇ UNVERIFIED |
| CSChristenson Surfboards, INC. | San Marcos | CA | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| CCCliniqa Corporation | San Marcos | CA | Chemical Manufacturing325413 | — | ◇ UNVERIFIED |
| CVCmjm Ventures, INC. | San Marcos | CA | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| CIConamore INC | San Marcos | CA | Food Manufacturing311821 | — | ◇ UNVERIFIED |
| DMDavid Maldonado | San Marcos | CA | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| DTDeupree Trucking Corporation | San Marcos | CA | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |