Security company licensing in Delaware
Delaware State Police, Professional Licensing Section licenses security companies here, but we do not yet carry its roster, so we cannot tell you who is on it.
The State Police licence guard firms under 24 Del. C. Ch. 13 but publish no roster or lookup — only application instructions. Delaware's open-data portal carries 79 firms under a 'security guard/private detective' business-tax licence category, but that is a revenue registration, not the police licence.
Until then, verify a company with the regulator directly, and treat any license number a company gives you as a claim we have not checked.
Delaware State Police, Professional Licensing Section →What you can still check
There is a second license, and in Delaware it may be the only one that exists: the guard’s own.
What a guard and a company should hold in Delaware, and how to confirm it →