| BPBel-Art Products, Pocomoke, MD | Pocomoke | MD | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
| CCCertainTeed Corporation Williamsport Maryland | Williamsport | MD | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
| DWD Wheatley Enterprises INC | Belcamp | MD | Plastics and Rubber Products Manufacturing326199 | — | ◐ LIKELY ACTIVE |
| FEFabricated Extrusion Company of Maryland, LLC | Hagerstown | MD | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| HIHarrington Industrial Plastics LLC | Elkridge | MD | Plastics and Rubber Products Manufacturing326122 | — | ▲ REPORTED CLOSED |
| KCKols Containers, INC. | Baltimore | MD | Plastics and Rubber Products Manufacturing326160 | — | ◐ LIKELY ACTIVE |
| MMMaryland Metals | Sparrows Point | MD | Plastics and Rubber Products Manufacturing326299 | 20-99 | ◐ LIKELY ACTIVE |
| OFOld Federal Tool Co, INC | Forest Hill | MD | Plastics and Rubber Products Manufacturing326199 | — | ◐ LIKELY ACTIVE |
| PPPerformance Pipe | Hagerstown | MD | Plastics and Rubber Products Manufacturing326122 | 20-99 | ◐ LIKELY ACTIVE |
| RTRadial Tire Company | Silver Spring | MD | Plastics and Rubber Products Manufacturing326211 | — | ◐ LIKELY ACTIVE |
| RCRing Container Hagerstown | Hagerstown | MD | Plastics and Rubber Products Manufacturing326160 | 20-99 | ◐ LIKELY ACTIVE |
| RRRosecorp Rubber, LLC | Silver Spring | MD | Plastics and Rubber Products Manufacturing326220 | — | ◐ LIKELY ACTIVE |
| SPSaint-Gobain PERF PLASTCS CORP | Gaithersburg | MD | Plastics and Rubber Products Manufacturing326111 | 20-99 | ◐ LIKELY ACTIVE |
| TTenax | Baltimore | MD | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| UUnipec | Rockville | MD | Plastics and Rubber Products Manufacturing326121 | 1-19 | ◐ LIKELY ACTIVE |
| VCVytex Corporation | Laurel | MD | Plastics and Rubber Products Manufacturing326199 | 100-499 | ◐ LIKELY ACTIVE |
Walnut Hill Works, LLC | Berlin | MD | Plastics and Rubber Products Manufacturing326199 | — | ◐ LIKELY ACTIVE |
| ADApogee Designs LTD | Baltimore | MD | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| AMAssociated Materials LLC | Parkville | MD | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| BGBerry Global | Hannover | MD | Plastics and Rubber Products Manufacturing326160 | — | ◇ UNVERIFIED |
| CNCardinal Novelty LLC | Rosedale | MD | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| CUComposites USA | North East | MD | Plastics and Rubber Products Manufacturing326130 | — | ◇ UNVERIFIED |
| DMDipole Materials, INC | Baltimore | MD | Plastics and Rubber Products Manufacturing326220 | — | ◇ UNVERIFIED |
| MTMccarthy Tire Service Company of Maryland INC | Federalsburg | MD | Plastics and Rubber Products Manufacturing326212 | — | ◇ UNVERIFIED |
| QOQrs of Maryland, LLC | Dundalk | MD | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| RTResley Tire CO INC | Hagerstown | MD | Plastics and Rubber Products Manufacturing326212 | — | ◇ UNVERIFIED |
| SSSailing Specialty Partners, INC. | Hollywood | MD | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| SVShoreline Vinyl Systems, INC. | Denton | MD | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| SSSimpson Strong-tie Company, INC. | Baltimore | MD | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| TPTim Plastics INC | North East | MD | Plastics and Rubber Products Manufacturing326160 | — | ◇ UNVERIFIED |
| TITrancendia, INC. | Elkridge | MD | Plastics and Rubber Products Manufacturing326113 | — | ◇ UNVERIFIED |
| VPVac Pac Manufacturing | Baltimore | MD | Paper Manufacturing322220 | — | ◇ UNVERIFIED |