| Business | Phone |
| Ge Supply 211 Pearl St, Portland 4101 | (207) 772-3721 |
| Graybar Electric Co 29 W Commercial St, Portland 4101 | (207) 773-1766 |
| H R Distributors Inc 101 Hanover St, Portland 4101 | (207) 773-2552 |
| Independent Electrical Supply 170 Anderson St, Portland 4101 | (207) 347-7210 |
| Industrial Automation Supply 23 Evergreen Dr, Portland 4103 | (207) 797-2345 |
| Rockingham Electric Supply Co 219 Anderson St, Portland 4101 | (207) 772-4614 |
| Ced Gilman Electric Supply 85 Saint James St, Portland 4102 | (207) 761-7788 |
| Com Nav Engineering 987 Riverside St, Portland 4103 | (207) 797-4588 |
| Timeco Systems Inc 29 Portland St, Portland 4101 | (207) 772-6294 |
| Wesco Distributing Inc 327 Marginal Way, Portland 4101 | (207) 772-6507 |