| Company Name | Street | Suite | City | St | Zip | Phone | Fax | Website |
| Diebold Inc | 1221 S Beltline Rd | Ste 700 | Coppell | TX | 75019 | (469) 549-7600 | www.diebold.com | |
| Grayson Pro-Tech Inc | 3729 N State Highway 91 | Denison | TX | 75020 | (903) 463-7767 | www.graysonprotech.com | ||
| Smith Thompson Security Systems | PO Box 260689 | Plano | TX | 75026 | (972) 526-8500 | www.smiththompson.com | ||
| Gurkin Security Systems Inc | PO Box 294836 | Lewisville | TX | 75029 | (940) 498-1818 | (940) 321-7292 | ||
| NBE National Bank Equipment Inc | 433 National Dr | Rockwall | TX | 75032 | (972) 771-4930 | www.nbenational.com | ||
| APi Systems Group | 2609 National Cir | Garland | TX | 75041 | (214) 291-1200 | |||
| Protection One Alarm Monitoring Inc | 4221 W John Carpenter Fwy | Irving | TX | 75063 | (214) 277-0100 | (972) 929-4174 | www.protectionone.com | |
| Hyatt Technical Services Inc | 3910 Industrial St | Rowlett | TX | 75088 | (214) 607-9678 | (214) 607-9680 | www.hytechservices.com | |
| Monitronics International Inc | PO Box 814530 | Dallas | TX | 75381 | (972) 243-7443 | (972) 243-1022 | www.monitronics.com | |
| Horne Enterprises Inc | 101 E Pinecrest Dr | Atlanta | TX | 75551 | (903) 796-4107 | (903) 796-7809 | www.hornenterprises.com | |
| Faith Communications | 607 E Grand Ave | Marshall | TX | 75670 | (318) 425-5977 | (318) 227-8955 | www.shrevecomm.net | |
| Access Security and Control Integrators | 1604 Lilac Ave | Lufkin | TX | 75901 | (936) 635-1461 | (936) 637-3797 | ||
| Fortress Security LLC | 2000 E Randol Mill Rd | Ste 611 | Arlington | TX | 76011 | (817) 226-7233 | (817) 701-0332 | |
| Capron Enterprise | 110 Inwood Trail | Azle | TX | 76020 | (817) 448-8367 | www.capronenterprise.com | ||
| CandCNET Associates Inc | 5330 Griggs Rd | Box 43 Ste A119 | Houston | TX | 77021 | (713) 845-2532 | (713) 643-4744 | www.candcworld.net |
| WM Security Services Inc | 17340 Chanute Rd | Houston | TX | 77032 | (281) 784-4040 | (281) 784-4054 | www.wmsecurityservices.com | |
| Safeguard Home Security | 888 W Sam Houston Pkwy S | Ste 170 | Houston | TX | 77042 | (713) 783-7347 | (713) 975-1058 | www.safeguardhomesecurity.com |
| Protection One Alarm Monitoring Inc | 4321 W Sam Houston Pkwy N | Ste 170 | Houston | TX | 77043 | (713) 937-0707 | (713) 937-1030 | www.protectionone.com |
| Halco Life Safety Systems Inc | 4210 South Dr | Houston | TX | 77053 | (713) 667-9424 | (713) 667-9313 | www.halcolss.com | |
| ASAP Security Services | 11275 Windfern Rd | Ste B | Houston | TX | 77064 | (281) 807-3553 | (281) 890-5995 | www.asapsecurityservices.com |
| D & N Services Inc | 203 W League City Pkwy | League City | TX | 77573 | (281) 338-4417 | |||
| Advanced Systems & Alarm Services | 1130 Lindbergh Dr | Ste C | Beaumont | TX | 77707 | (409) 840-2077 | (409) 840-5250 | |
| VCS Security Systems Inc | 3202 N Navarro St | Victoria | TX | 77901 | (361) 575-1528 | (361) 570-1298 | www.viccomm.com | |
| Hill Country Telecommunications LLC | PO Drawer D | Ingram | TX | 78025 | (830) 367-1111 | (830) 367-5993 | www.hctc.net | |
| Protection One Alarm Monitoring Inc | 634 W Sunset Rd | San Antonio | TX | 78216 | (210) 525-0600 | (210) 832-8434 | www.protectionone.com | |
| The Safeguard System Inc | 4401 Kostoryz Rd | Corpus Christi | TX | 78415 | (361) 854-1144 | (361) 854-1904 | ||
| Protection One Alarm Monitoring Inc | 1200 E Hackberry Ave | Ste I | McAllen | TX | 78501 | (956) 686-1339 | (956) 686-4826 | www.protectionone.com |
| Protect America Inc | 5100 N I H 35 | Ste B | Round Rock | TX | 78681 | (800) 951-5111 | (512) 246-7218 | www.protectamerica.com |
| Protection One Alarm Monitoring Inc | 11525 Stonehollow Dr | Ste 155 | Austin | TX | 78758 | (512) 302-9040 | (512) 302-0297 | www.protectionone.com |
| Allstate Security Industries Inc | 3433 Plains Blvd | Amarillo | TX | 79102 | (806) 354-3200 | (806) 354-3223 | www.allstatesecurity.com | |
| Firehawk Safety Systems Inc | 3219 Commerce St | Amarillo | TX | 79109 | (806) 351-0011 | (806) 351-0021 | ||
| Alarm Link Security | PO Box 50837 | Amarillo | TX | 79159 | (806) 354-0050 | (806) 354-0358 | www.broadviewsecurity.com | |
| Alarm Link Security | 3140 34th St | Lubbock | TX | 79412 | (806) 722-0051 | (806) 722-0056 |