An adjustable hanger assembly comprises a hanger, a hanger mount, and a bracket assembly. The hanger comprises a first set of serrations, a center slot, and a hanger tab. The hanger mount comprises a second set of serrations, and a mount aperture. The hanger mount aperture is positioned in coplanar alignment with the center slot axis. The hanger and the hanger mount are assembled together by meshing the serrations in the first and second sets of serrations in a pre-selected position to accommodate users' positioning requirements. A mounting fastener extends through the hanger and the hanger mount for clamping the abutting assembly together and mounting the same to a wall. The hanger assembly is laterally positionable within, and snap-fittable to, the bracket assembly. Together the hanger assembly and the bracket assembly enable the user to adjust the target wall-hanging in two-dimensional space.