| ABAccurate Burring Co, LLC | Plainville | CT | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| AIAggregate Industries Northeast Region | Plainville | MA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ARAtco Rubber Products | Plainville | GA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| BCBasf Catalysts | Plainville | MA | Primary Metal Manufacturing331419 | — | ◇ UNVERIFIED |
| GEGeneral Electric Consumer & Industrial | Plainville | CT | Electrical Equipment, Appliance & Component Manufacturing335313 | — | ◇ UNVERIFIED |
| HHHilco-the Hilsinger Company | Plainville | MA | Miscellaneous Manufacturing339115 | — | ◇ UNVERIFIED |
| ICIndependent Concrete Pipe | Plainville | MA | Nonmetallic Mineral Product Manufacturing327332 | — | ◇ UNVERIFIED |
| MLMass Lite Div | Plainville | MA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
 Mini Systems Incorporated | Plainville | MA | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| MMMott Metallurgical CORP. | Plainville | CT | Fabricated Metal Product Manufacturing332117 | — | ◇ UNVERIFIED |
| NCNortheast Concrete Products CORP. | Plainville | MA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PSPhoenix Soil, LLC | Plainville | CT | Chemical Manufacturing325314 | — | ◇ UNVERIFIED |
| PSPlainville Stock CO | Plainville | MA | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| WPWasley Products/precision Molding | Plainville | CT | Plastics and Rubber Products Manufacturing326299 | — | ◇ UNVERIFIED |
| FMForestville Machine CO | Plainville | CT | Fabricated Metal Product Manufacturing332721 | — | ◇ UNVERIFIED |
| HPHygrade Precision Technologies, INC. | Plainville | CT | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| 5M50 Milford Street Ext Plainville Ct, LLC | Plainville | CT | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| AIAA-Install inc. | Plainville | MA | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| AWAlloy Welding | Plainville | CT | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| ABAtlantic Broom Service, Inc. | Plainville | MA | Machinery Manufacturing333999 | — | ◇ UNVERIFIED |
| BEBuilding Envelope Systems | Plainville | MA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| CRCmc Rebar-ct-plainville | Plainville | CT | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| CSConnecticut Solid Surface, LLC | Plainville | CT | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| CHCT Hone Inc | Plainville | CT | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| DEDesco Electronics INC | Plainville | MA | Computer and Electronic Product Manufacturing334220 | — | ◇ UNVERIFIED |
| EPExecutive Press, INC. | Plainville | CT | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| FCFluid Control Solutions, LLC | Plainville | CT | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| GCGe CO | Plainville | CT | Electrical Equipment, Appliance & Component Manufacturing335313 | — | ◇ UNVERIFIED |
| HPHeleniak Properties, LLC | Plainville | CT | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| HRH.m.h. Religious Manufacturing, INC. | Plainville | MA | Miscellaneous Manufacturing339910 | — | ◇ UNVERIFIED |
| NENational Eastern Corporation | Plainville | CT | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NPNonnie's Pies & Creations, LLC | Plainville | CT | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| OBOlson Brothers CO | Plainville | CT | Fabricated Metal Product Manufacturing332721 | — | ◇ UNVERIFIED |
| PPPlainville Products CORP | Plainville | MA | Machinery Manufacturing333319 | — | ◇ UNVERIFIED |
| SSSCG Signs Inc | Plainville | MA | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| SHSchult Homes | Plainville | KS | Wood Product Manufacturing321991 | — | ◇ UNVERIFIED |
| WBWitchdoctor Brewing Company LLC | Plainville | CT | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
