The present invention is directed to a wall mount bracket that supports a cable tray in a cable routing system. The wall mount bracket includes a back wall and a sidewall. The back wall has a top, a bottom, sides and mounting holes positioned therebetween. The sidewall extends outwardly from one side of the back wall. The longitudinal wires of the cable tray are positioned on the sidewall of the wall mount bracket. The sidewall also has a distal end with an engaging member that receives a bottom longitudinal wire of the sidewall of the cable tray.