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Contact Information

Sales: (800) 244-2261

Security Instrument is the largest privately owned commercial security company in Delaware. We design, install and support integrated systems for homes, small businesses and large enterprises throughout Delaware, Pennsylvania, New Jersey and Maryland.


Wilmington, DE Office
309 West Newport Pike
Wilmington, DE 19804
Phone: (302) 633-5621

Milton, DE Office

28340 Lewes Georgetown Hwy.
Milton, DE 19968
Phone: (302) 645-2212