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Castle Security Group is a Catonsville, MD-based company in the Business Services sector.
Crown Security System Inc is a Baltimore, MD-based company in the Business Services sector.
MP Security Service is a Gallatin, TN-based company in the Business Services sector.
Computer Systems Group is a Manassas, VA-based company in the Business Services sector.
Headquartered in Dallas, Texas, Monitronics International has over 20 years` experience protecting homes and businesses. More than 1 million people trust us to protect what matters to them with our award-winning alarm monitoring services. We work solely through our network of nationwide, independent authorized dealers. Together, we provide reliable, uninterrupted security monitoring service.