Security jobs in your ZIP code Missouri Security Guard Training Requirements Unlike most US states the state of Missouri does not require Security Guards to be licensed. Even then, the following six Missouri cities have local legislations requiring a valid security license for anyone working as a security guard or officer in their jurisdiction. Even if the jurisdiction you plan to work doesn’t require a license, to work as a Security Guard in the Missouri state, you will need to go through fingerprinting and background checking. You can follow this link to find security guard jobs in Missouri State. For ...