| Business | Phone |
| Alarm Pro-Tech Systems Inc 697 Windsor Dr, Westminster 21158 | (410) 857-5039 |
| Crs Security Inc 1023 Washington Rd # B, Westminster 21157 | (410) 876-7264 |
| Diversified Technologies Inc Westminster 21157 | (410) 526-5516 |
| Smart Home Prtctn Systems Inc 132 Marydell Dr, Westminster 21157 | (410) 386-0022 |
| Westminster Security Co 141 W Main St, Westminster 21157 | (410) 875-2126 |