| OCOld Courthouse Distilling | Centreville | MD | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| OFOld Federal Tool Co, INC | Forest Hill | MD | Plastics and Rubber Products Manufacturing326199 | — | ◐ LIKELY ACTIVE |
| OHOld Harford LLC | Pylesville | MD | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| OLOld Line Custom Meat Company LLC | Baltimore | MD | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| OWOld Westminster Vineyard | Westminster | MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| OWOlney Winery | Beltsville | MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| OFOrlowski Family Vineyards | Knoxville | MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| OOOstrowski's of Bank St. | Baltimore | MD | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| ODOversea Distillery | Columbia | MD | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| OMOwings Mills | Owings Mills | MD | Food Manufacturing311999 | 100-499 | ◐ LIKELY ACTIVE |
| PDPatapsco Distilling Company | Sykesville | MD | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| PFPathfinder Farm | Keedysville | MD | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| PRPaul Reed Smith Guitars Limited Partnership | 380 Log Canoe Circle, Stevensville, MD 21666 | MD | Miscellaneous Manufacturing339992 | 100-499 | ◐ LIKELY ACTIVE |
| PHPBV-Snow Hill Rd. | Salisbury | MD | Beverage and Tobacco Product Manufacturing312111 | 20-99 | ◐ LIKELY ACTIVE |
| PBPepsi Bottling Ventures LLC | Salisbury | MD | Beverage and Tobacco Product Manufacturing312111 | — | ◐ LIKELY ACTIVE |
| PFPerdue Foods, LLC | Salisbury | MD | Food Manufacturing311615 | — | ◐ LIKELY ACTIVE |
| PPPerformance Pipe | Hagerstown | MD | Plastics and Rubber Products Manufacturing326122 | 20-99 | ◐ LIKELY ACTIVE |
| PVPerigeaux Vineyards and Winery | St Leonard | MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| PWPerry & Wilson, INC. | Silver Spring | MD | Furniture and Related Product Manufacturing337121 | — | ◐ LIKELY ACTIVE |
| PMP&F Meat Market | Landover | MD | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| PIPhiltec, INC | Annapolis | MD | Computer and Electronic Product Manufacturing334513 | — | ◐ LIKELY ACTIVE |
| PPPilot Plant | Frederick | MD | Chemical Manufacturing325414 | 100-499 | ◐ LIKELY ACTIVE |
| PDPine Distilling, LLC | Frederick | MD | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| PJPizza John's Wholesale LLC | Essex | MD | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| P1Plant 1 | Timonium | MD | Food Manufacturing311230 | 20-99 | ◐ LIKELY ACTIVE |
| POPoint of Rocks MD Millwork | Point of Rocks | MD | Furniture and Related Product Manufacturing337212 | 20-99 | ◐ LIKELY ACTIVE |
| PIPooles Island Brewing Company, LLC | Middle River | MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| PLPoolesville Lawn Equipment INC | Poolesville | MD | Fabricated Metal Product Manufacturing332510 | — | ◐ LIKELY ACTIVE |
| PHPort House Grill | North East | MD | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| POPort of Leonardtown Winery | Leonardtown | MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| PSPowercon South | Odenton | MD | Nonmetallic Mineral Product Manufacturing327110 | 20-99 | ◐ LIKELY ACTIVE |
| PFPremier Five Global Solutions LLC | Fort Washington | MD | Food Manufacturing311920 | — | ◐ LIKELY ACTIVE |
| PGPrince George's County Organics Composting Facility | Upper Marlboro | MD | Chemical Manufacturing325314 | 20-99 | ◐ LIKELY ACTIVE |
| PIPrint-o-stat INC. | Cockeysville | MD | Printing and Related Support Activities323111 | — | ◐ LIKELY ACTIVE |
| PIPrint-o-stat INC. | Linthicum Heights | MD | Printing and Related Support Activities323111 | — | ◐ LIKELY ACTIVE |
| FC"Production Facilities - Columbia, MD" | Columbia | MD | Printing and Related Support Activities323111 | 20-99 | ◐ LIKELY ACTIVE |
| PFProform Finishing Products - Belcamp | Belcamp | MD | Nonmetallic Mineral Product Manufacturing327420 | 20-99 | ◐ LIKELY ACTIVE |
| PSProtechnology Solutions LLC | Elkridge | MD | Fabricated Metal Product Manufacturing332410 | — | ◐ LIKELY ACTIVE |
| PRPuerto Rico Distillery | Brunswick | MD | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| QOQuality of Life Pharmacy & Health, INC. | Capitol Heights | MD | Chemical Manufacturing325991 | — | ◐ LIKELY ACTIVE |
| RERaff Embossing and Foilcraft, INC. | Hyattsville | MD | Paper Manufacturing322230 | — | ◐ LIKELY ACTIVE |
| RARaytheon Applied Signal Technology, INC. | Annapolis Junction | MD | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| RCRaytheon Company | Riverdale | MD | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| RBR & B Steel Fabrications INC | Potomac | MD | Machinery Manufacturing333112 | — | ◐ LIKELY ACTIVE |
| RQRc Quartermaster LLC | Silver Spring | MD | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
| RIReddy Ice - Upper Marlboro (476) | Upper Marlboro | MD | Beverage and Tobacco Product Manufacturing312113 | 20-99 | ◐ LIKELY ACTIVE |
| RHRed Heifer Winery | Smithsburg | MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| RLRed Lorry, LLC | Annapolis | MD | Food Manufacturing311520 | — | ◐ LIKELY ACTIVE |
| RBREEB - Barclay Core | Barclay | MD | Wood Product Manufacturing321911 | 100-499 | ◐ LIKELY ACTIVE |
| RCRegent Cabinets Maryland Warehouse | North East | MD | Furniture and Related Product Manufacturing337110 | 20-99 | ◐ LIKELY ACTIVE |