Security Systems Monitoring Companies
| Security Technologies (Fredericksburg, VA)
Primarily Serving: Burke, VA - Centreville, VA - Annandale, VA - Alexandria, VA |
| Security Usa (Grand Prairie, TX)
Primarily Serving: Arlington, TX - Irving, TX - Euless, TX - Dallas, TX |
| Security Watch (Allentown, PA)
Primarily Serving: Bethlehem, PA - Reading, PA - Levittown, PA - Philadelphia, PA |
| Security With Advanced Tech (Broomfield, CO)
Primarily Serving: Westminster, CO - Thornton, CO - Arvada, CO - Boulder, CO |
| Securitylink From Ameritech (Madison, WI)
Primarily Serving: Janesville, WI - Waukesha, WI - Rockford, IL - Milwaukee, WI |
| Secutor Systems Inc (Chesapeake, VA)
Primarily Serving: Portsmouth, VA - Norfolk, VA - Virginia Beach, VA - Suffolk, VA |
| Sense of Security (Denham Springs, LA)
Primarily Serving: Baton Rouge, LA - Kenner, LA - Metairie, LA - New Orleans, LA |
| Sensormatic (Amelia Court Hou, VA) |
| Servare (Harrisonburg, VA)
Primarily Serving: Lynchburg, VA - Charles Town, WV - Centreville, VA - Burke, VA |
| Sevss (Bloomfield, NM)
Primarily Serving: Rio Rancho, NM - Santa Fe, NM - Albuquerque, NM - Grand Junction, CO |
| Sharp Holding Corp (Houston, TX)
Primarily Serving: Pasadena, TX - Missouri City, TX - Sugar Land, TX - League City, TX |
| Sharp Technology Inc (Houston, TX)
Primarily Serving: Pasadena, TX - Missouri City, TX - Sugar Land, TX - League City, TX |
| Shield Security Systems (Addison, TX)
Primarily Serving: Carrollton, TX - Richardson, TX - Plano, TX - Irving, TX |
| Sierra Security Llc (Stevensville, MT)
Primarily Serving: Missoula, MT - Great Falls, MT - Spokane, WA - Boise, ID |
| Sigma Surveillance Inc (Plano, TX)
Primarily Serving: Richardson, TX - Allen, TX - Garland, TX - Frisco, TX |
| Silver Mountain Design Ltd (Phoenix, AZ)
Primarily Serving: Glendale, AZ - Tempe, AZ - Peoria, AZ - Scottsdale, AZ |
| Skylight Technologies (Miami, FL)
Primarily Serving: Miami Beach, FL - Hialeah, FL - North Miami Beach, FL - Hollywood, FL |
| Skylink Security Inc (Phoenix, AZ)
Primarily Serving: Glendale, AZ - Tempe, AZ - Peoria, AZ - Scottsdale, AZ |
| Software Security Solutions (Denver, CO)
Primarily Serving: Westminster, CO - Arvada, CO - Aurora, CO - Thornton, CO |
| Sonitrol Corp (Berwyn, PA)
Primarily Serving: Philadelphia, PA - Camden, NJ - Wilmington, DE - Newark, DE |
| Sonitrol of Northern Nevada (Reno, NV)
Primarily Serving: Sparks, NV - Carson City, NV - El Dorado, CA - Loomis, CA |
| Sonitrol of St Petersburg (Saint Petersburg, FL)
Primarily Serving: Largo, FL - Clearwater, FL - Tampa, FL - Palm Harbor, FL |
| Sourcefire Inc (Longmont, CO)
Primarily Serving: Boulder, CO - Broomfield, CO - Loveland, CO - Thornton, CO |
| South Dade Security (Miami, FL)
Primarily Serving: Miami Beach, FL - Hialeah, FL - North Miami Beach, FL - Hollywood, FL |
| Southeastern System Tech (Savannah, GA)
Primarily Serving: North Charleston, SC - Charleston, SC - Mount Pleasant, SC - Augusta, GA |
