Plastic injection molding companies in New Hampshire
New Hampshire has 30 plastic injection molders in EPA records, facilities that list codes for plastic parts and products made by molding, including injection-molded components. The most are in Hudson, Merrimack and Nashua. That is under 1% of the 3,730 such facilities nationwide, and New Hampshire ranks #33 of 49 states.
- Product
- Plastic injection molding companies
- Facilities
- 30
- State rank
- #33
- NAICS
- 326121, 326122, 326199
- Revised
- November 1, 2026
Facilities in New Hampshire
These are active facilities in EPA's ECHO database that list a code for plastic parts and products made by molding, including injection-molded components.
| Facility | City | What EPA lists |
|---|---|---|
| American Performance Polymers | Colebrook | All Other Plastics Product Manufacturing |
| Nylon Corporation Of America | Manchester | All Other Plastics Product Manufacturing |
| Millipore Corp | Jaffrey | All Other Plastics Product Manufacturing |
| Gi Plastek Corp. | Wolfeboro | All Other Plastics Product Manufacturing |
| Index Packaging, Inc., D/B/A Avilite | Merrimack | All Other Plastics Product Manufacturing |
| Mw Manufacturers Inc. | Londonderry | All Other Plastics Product Manufacturing |
| Spartech LLC - Tufpak | Ossipee | All Other Plastics Product Manufacturing |
| Critical Process Filtration Inc | Nashua | All Other Plastics Product Manufacturing |
| Delfex Innovations LLC | Berlin | All Other Plastics Product Manufacturing |
| Duro Fiber Co Inc | Hudson | All Other Plastics Product Manufacturing |
| Duxbury Composite Products | Fitzwilliam | All Other Plastics Product Manufacturing |
| Eptam Plastics | Tilton | All Other Plastics Product Manufacturing |
| Hcp Packaging USA, Inc. | Hinsdale | All Other Plastics Product Manufacturing |
| Johnson Precision, Inc. | Hudson | All Other Plastics Product Manufacturing |
| Lightblocks Mfg LLC | Merrimack | All Other Plastics Product Manufacturing |
| Material Technologies & Sciences Inc | Dover | All Other Plastics Product Manufacturing |
| Microspec Corp | Peterborough | Unlaminated Plastics Profile Shape Manufacturing |
| Molded Rubber And Plastics | Hudson | All Other Plastics Product Manufacturing |
| Mti Polyexe Inc | Brentwood | All Other Plastics Product Manufacturing |
| Pak 2000 | Tuftonboro | All Other Plastics Product Manufacturing |
| Pelham Plastics Inc | Pelham | All Other Plastics Product Manufacturing |
| Plan Tech Inc | Loudon | Unlaminated Plastics Profile Shape Manufacturing |
| Presby Environmental, Inc. | Whitefield | Plastics Pipe and Pipe Fitting Manufacturing |
| Pretium Packaging | Nashua | All Other Plastics Product Manufacturing |
| Reinforced Plastics | Danville | All Other Plastics Product Manufacturing |
| Resin Systems Corporation | Amherst | All Other Plastics Product Manufacturing |
| Scandia Plastics Inc | Plaistow | Plastics Pipe and Pipe Fitting Manufacturing |
| Spherex Inc | Seabrook | All Other Plastics Product Manufacturing |
| Vaupell Rapid Solutions | Hudson | All Other Plastics Product Manufacturing |
| Vygon US Inc | Dover | Unlaminated Plastics Profile Shape Manufacturing |
Industry codes are reported by facilities to EPA programs and are not checked here. A few listings may be repair shops, distributors or recyclers. How these records work.
Where they are
- Hudson: 4
- Merrimack: 2
- Nashua: 2
- Dover: 2
- Colebrook: 1
- Manchester: 1
By product code
- All Other Plastics Product Manufacturing (NAICS 326199): 25
- Unlaminated Plastics Profile Shape Manufacturing (NAICS 326121): 3
- Plastics Pipe and Pipe Fitting Manufacturing (NAICS 326122): 2
All plastics and rubber manufacturing in New Hampshire: 38 facilities and Census job counts.