A telephone access jack security device for an access jack mounted in a faceplate of a fixture. The security device comprises a baseplate adapted to mount on the front of the faceplate having an opening therein adapted to expose the connector receptacle. A locking member is attached to the baseplate and extends outwardly therefrom. A coverplate, of substantially unitary contruction, having suitable dimensions to substantially cover the baseplate, is placed in parallel overlying relationship therewith, forming a cavity between the baseplate and the coverplate sufficiently sealed to prevent passage of a telephone connector. The coverplate has an opening therein sufficient to permit the close passage of the locking member therethrough when the coverplate and the baseplate are placed in the parallel overlying relationship with one another. The coverplate and baseplate are hinged together to permit the coverplate to be placed in this substantially parallel overlying relationship with the baseplate. The hinge connection points of the coverplate and the baseplate are substantially within the cavity formed between the coverplate and the baseplate to effectively proclude tampering therewith.