| PAPreston Auto Body of Wilmington | Wilmington | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| PPProcino Plating | Blades | DE | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| PCPtfe Compounds INC | New Castle | DE | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| PBPuzs Body Shop INC | Newark | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| QLQps, LLC | Newark | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| QAQuality Auto Care - 700 Forest St, Dover | Dover | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| QAQuality Auto Care Center - Rt 42, Cheswold | Cheswold | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| RCRainbow Cleaners | Wilmington | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| RLRed Lion Medical Safety INC | Newark | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| RTReynolds Towing | Bear | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| RARichs Auto Body Rd 1 Box 73a, Dagsboro | Dagsboro | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| RMR & M Trucking | Lincoln | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| RARohm and Haas Electronic Materials Cmp INC | Newark | DE | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| RFRoos Foods - 251 Cooper St, Kenton | Kenton | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| SPSchering Plough Animal Health - 369 West Dupont Highway, Millsboro | Millsboro | DE | Chemical Manufacturing325414 | — | ◇ UNVERIFIED |
| SLSeaboard Lumber - Rt 18 West, Bridgeville | Bridgeville | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| STSeiberlich Trane Service | Wilmington | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| SCSeymours Cleaners | Wilmington | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| S1Shell 1416 - Talleyville | Wilmington | DE | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| SHShellhorn & Hill a Street Terminal | Wilmington | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| SOShell Oil Company | Newark | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| SCShooters Choice - 5105 North Dupont Highway, Dover | Dover | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| SHSiemens Healthcare Diagnostics - Rt 896, Glasgow | Newark | DE | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| SLSolenis, LLC | Wilmington | DE | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
 Southern States/milford CO Op | Milford | DE | Chemical Manufacturing325222 | — | ◇ UNVERIFIED |
| SGSpeedy Gas | Newark | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| SPSpi Polyols INC. | New Castle | DE | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| SOSquare One Electric Service - 347 Fork Branch Rd, Dover | Dover | DE | Chemical Manufacturing325222 | — | ◇ UNVERIFIED |
| SCStandard Chlorine of Delaware, INC. Superfund Site | New Castle | DE | Chemical Manufacturing325100 | — | ◇ UNVERIFIED |
| SEStar Enterprise | Newark | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| SOState of Delaware Graphics & Printing - 604 Otis Dr, Dover | Dover | DE | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| SASumpter Auto Refinishing | Dover | DE | Chemical Manufacturing325222 | — | ◇ UNVERIFIED |
| SSSunoco Service Station | Dover | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| TMTaylor & Messick - 325 Walt Messick Rd, Harrington | Harrington | DE | Machinery Manufacturing333112 | — | ◇ UNVERIFIED |
| TDTilcon Delaware Gumboro | Frankford | DE | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| TDTilcon Delaware, INC. - Terminal Avenue | New Castle | DE | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| TCTowne & Country Cleaners, INC | Wilmington | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| TMTri-county Materials | Dover | DE | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| TTrugreen | Newport | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| VDVerizon Dover Soc | Dover | DE | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| WIWalker, Irwin C. Jr Farm | New Castle | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| WFWalkers Florist & Greenhouse INC | Hockessin | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| WLWilmington Leather Coatings | New Castle | DE | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| WPWilmington Piece Dye CO. (closed) | Wilmington | DE | Textile Mills313310 | — | ◇ UNVERIFIED |
| WFWinner Ford | Newark | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| WLW L Gore & Associates INC Otts Chapel Site | Newark | DE | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| WWWm Wilmington Hauling - Meter 2 | Wilmington | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| WBWorthy Brothers Pipeline CO | Wilmington | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| YIYrc INC. D/b/a Yrc Freight | New Castle | DE | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| AIAmerican Insert Flange Company, Inc. | Wilmington | DE | Fabricated Metal Product Manufacturing332919 | 1-19 | ◇ UNVERIFIED |
