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Largest Manufacturing Industries | Mailing Address/Phone | Approximate Number of Employees |
| Mars Chocolate, North America www.mars.com | 800 High Street Hackettstown, NJ 07840 908-852-1000 | 1000 |
DSM Nutritional Products www.nutraaccess.com | 206 Roche Drive Belvidere, NJ 07823 908-475-5300 | 265 |
| Al Can Packaging www.alcan.com | 191 Route 31 North Washington, NJ 07882 908-689-3000 | 235 |
| Bihler of America www.bihler.com | 85 Industrial Drive Alpha, NJ 08865 908-213-9001 | 215 |
| Atlantic States Cast Iron Pipe Co. www.atlanticstates.com | 183 Sitgreaves Street Phillipsburg, NJ 08865 908-454-1161 | 205 |
| Spectra Gases, Inc. www.spectragases.com | Industrial Drive Alpha, NJ 08865 908-545-7455 | 200 |
| Graham Packaging www.grahampackaging.com | 600 Fifth Street Belvidere, NJ 07823 908-475-2181 | 123 |
| Mallinckrodt/Baker, Inc www.mallbaker.com | 222 Red School Lane Phillipsburg, NJ 08865 908-859-2151 | 121 |
| Hunterdon Transformer | 75 Industrial Drive Phillipsburg, NJ 08865 908-454-2400 | 106 |
| EJ Brooks | 165 Howard Street Phillipsburg, NJ 08865 908-454-4500 | 92 |
