| SDSmiths Detection Edgewood, INC. | Edgewood | MD | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| SSSoil Safe INC | Brandywine | MD | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| SCSolo Cup | Owings Mills | MD | Paper Manufacturing322215 | — | ◇ UNVERIFIED |
| SCSolo Cup Company | Federalsburg | MD | Paper Manufacturing322219 | — | ◇ UNVERIFIED |
| SMSouthern Maryland Wood Treatment | Hollywood | MD | Wood Product Manufacturing321114 | — | ◇ UNVERIFIED |
| SSSouthern States Cooperative, INC - Queen Anne's County Service | Centreville | MD | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| SSSouthern States Coop, INC. - Frederick | Frederick | MD | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| SSprint | Beltsville | MD | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| SRStandard Register Company | Salisbury | MD | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| SFStatton Furniture | Hagerstown | MD | Furniture and Related Product Manufacturing337122 | — | ◇ UNVERIFIED |
| SFStevens Flexible Packaging Incorporated | Hagerstown | MD | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| SIStone Industrial | College Park | MD | Paper Manufacturing322214 | — | ◇ UNVERIFIED |
 Sun Chemical CORP | Williamsport | MD | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| STSurface Treatment Technologies | Halethorpe | MD | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| SASwales & Assoc Frederick Av | Beltsville | MD | Computer and Electronic Product Manufacturing334511 | — | ◇ UNVERIFIED |
| SISyngene International LTD. | Baltimore | MD | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| TMTalley Metal Products | Hagerstown | MD | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| TTechalloy | Baltimore | MD | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| TFTechnical Finishers | Rosedale | MD | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| TETeledyne Energy Systems, INC. | Sparks | MD | Electrical Equipment, Appliance & Component Manufacturing335911 | — | ◇ UNVERIFIED |
| TGTexas Gulf Industries, INC. | Baltimore | MD | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| TCThe Custom District | Capitol Heights | MD | Furniture and Related Product Manufacturing337127 | — | ◇ UNVERIFIED |
| TSThe Sun Products Corporation | Baltimore | MD | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| TIThomas/bennett/hunter INC. | Westminster | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| TMThomas Manufacturing Corporation | Parkton | MD | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| TCTishcon CORP | Salisbury | MD | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| TITranscendia, INC | Elkridge | MD | Plastics and Rubber Products Manufacturing326112 | — | ◇ UNVERIFIED |
| THTulkoff Horseradish Frod | Baltimore | MD | Food Manufacturing311999 | — | ◇ UNVERIFIED |
| TFTyson Foods INC Berlin Processing | Berlin | MD | Food Manufacturing311611 | — | ◇ UNVERIFIED |
| UIUnilever Ice Cream | Hagerstown | MD | Food Manufacturing311412 | — | ◇ UNVERIFIED |
| UCUnited Coatings | Baltimore | MD | Transportation Equipment Manufacturing336510 | — | ◇ UNVERIFIED |
| UIUnited Iron & Metal | Baltimore | MD | Primary Metal Manufacturing331419 | — | ◇ UNVERIFIED |
| UPUnited Parcel Service - Quad (mdqua) | Baltimore | MD | Machinery Manufacturing333292 | — | ◇ UNVERIFIED |
| UMU.s. Marine - Cumberland I | Cumberland | MD | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| UMU.s. Marine - Salisbury | Salisbury | MD | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| UWU.s. Water Services | Aberdeen | MD | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| VPValley Proteins, INC. | Baltimore | MD | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| VIValleywood Industries, INC. | Baltimore | MD | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| VHVireo Health | Hurlock | MD | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| VHVulcan Hart Corporation | Dundalk | MD | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| WMWaldorf Marble | White Plains | MD | Plastics and Rubber Products Manufacturing326122 | — | ◇ UNVERIFIED |
| WTWalker Trading Company INC D.b.a. Vape Dojo | Middle River | MD | Beverage and Tobacco Product Manufacturing312230 | — | ◇ UNVERIFIED |
| WJWarring, James T Sons INC | Cheverly | MD | Fabricated Metal Product Manufacturing332439 | — | ◇ UNVERIFIED |
| WAWashington Aluminum | Baltimore | MD | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| WCWaugh Chapel Plant | Gambrills | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| WDWecare Denali, LLC | Woodbine | MD | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
| WJWells J V INC - Sharptown | Sharptown | MD | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| WCWerres Corporation | Frederick | MD | Machinery Manufacturing333924 | — | ◇ UNVERIFIED |
| WIWestern Industrial Machine | Westminster | MD | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| WPWestland Printers | Laurel | MD | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
