| Business | Phone |
| 163 Deer St Alarms 163 Deer St, Portsmouth 3801 | (603) 430-6891 |
| All Points Systems Inc 235 West Rd # 3, Portsmouth 3801 | (603) 433-8864 |
| Central Dispatch 500 Market St # 2c, Portsmouth 3801 | (603) 427-0459 |
| Central Signal Corp 500 Market St # 2a, Portsmouth 3801 | (603) 431-3664 |
| Datawatch Alarm Monitoring 56 Islington St, Portsmouth 3801 | (603) 433-5475 |
| Protection One Inc Portsmouth 3801 | (603) 433-3310 |
| Stat Security Systems 909 Islington St # A, Portsmouth 3801 | (603) 430-8300 |