| Business | Phone |
| Security Lock & Alarm 2116 4th St, Eureka 95501 | (707) 443-7226 |
| Superior Alarm Systems Inc 436 W Harris St, Eureka 95503 | (707) 000-1111 |
| Advanced Security Systems 135 W 7th St, Eureka 95501 | (707) 442-0681 |
| Humboldt Alarm Co 436 Harris St, Eureka 95503 | (707) 443-9430 |