Tri-State Security and Patrol Service is the largest locally-owned security company in the Sioux Falls, South Dakota area. Our experienced team has been keeping Sioux Falls and surrounding communities safe for over 40 years with security services. Our philosophy is to provide the highest quality security services and coverage to clientele with sophisticated demands. We offer a wide range of security services and can compete successfully for a contract of any size. Our staff is well trained and capable in all positions of responsibility. Contact us today to discuss your security requirements and keep yourself, your employees and your business safe. Small or large, your request will be met with expert advice, individualized attention, and innovative safety solutions. We can provide on-site security, uniformed security officers, event security and more in Sioux Falls and the surrounding areas! We look forward to working with you!