Abstract: A solar powered, illuminated mailbox post assembly includes a support post structure for supporting a mailbox operatively thereon. The support post structure includes a vertical post section for mounting in the ground and extending upwardly therefrom. The vertical post section has an interior chamber. A light unit is disposed in the chamber and includes a light source and a rechargeable power supply operatively connected to the light source for energizing the light source and causing the light source to illuminate. There is at least one solar collector operably connected to the rechargeable power supply for collecting solar energy and converting such energy to electric power that is directed to the power supply for recharging thereof. At least one window is formed in the vertical post section adjacent the chamber. The window bears indicia that are highlighted for display upon the window when the light is illuminated and light is transmitted through the window.