| Business | Phone |
| Tronica Circuits 26 Parkridge Rd, Haverhill 1835 | (978) 372-7224 |
| Circuit Board Express 2 Avco Rd, Haverhill 1835 | (978) 521-9288 |
| Circuit Technology 45 Computer Dr, Haverhill 1832 | (978) 373-1600 |
| Circuit Technology Ctr 45 Research Dr, Haverhill 1832 | (978) 374-5000 |
| Imi Inc 140 Hilldale Ave, Haverhill 1832 | (978) 373-9190 |
| Jeti Inc 26 Ward Hill Ave, Haverhill 1835 | (978) 374-0731 |