| DCD'amico Construction Company, INC. | Plainville | CT | Petroleum and Coal Products Manufacturing324121 | — | ◐ LIKELY ACTIVE |
| LSLee Spring Company Plainville CT | Plainville | CT | Fabricated Metal Product Manufacturing332613 | 1-19 | ◐ LIKELY ACTIVE |
| SSSetra Systems, INC. | Plainville | CT | Computer and Electronic Product Manufacturing334513 | — | ◐ LIKELY ACTIVE |
| TGTri-Star Glove | Plainville | IN | Apparel Manufacturing315220 | 20-99 | ◐ LIKELY ACTIVE |
| ZCZeeco Connecticut | Plainville | CT | Machinery Manufacturing333994 | 20-99 | ◐ LIKELY ACTIVE |
| DEDesco Electronics INC | Plainville | MA | Computer and Electronic Product Manufacturing334220 | 1-19 | ◇ UNVERIFIED |
| FMForestville Machine CO | Plainville | CT | Fabricated Metal Product Manufacturing332721 | — | ◇ UNVERIFIED |
| HRH.m.h. Religious Manufacturing, INC. | Plainville | MA | Miscellaneous Manufacturing339910 | 1-19 | ◇ UNVERIFIED |
| LSLisa S. Roberge dba Embroidery A2Z | Plainville | CT | Textile Product Mills314999 | 1-19 | ◇ UNVERIFIED |
| OBOlson Brothers CO | Plainville | CT | Fabricated Metal Product Manufacturing332721 | 1-19 | ◇ 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 |
| CRCmc Rebar-ct-plainville | Plainville | CT | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| CSConnecticut Solid Surface, LLC | Plainville | CT | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ 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 |
| NENational Eastern Corporation | Plainville | CT | Fabricated Metal Product Manufacturing332312 | — | ◇ 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 |
