The post office is a one-story red brick building. Its front elevation is flat, symmetrical, and classically-proportioned. Five bays divide the façade—two flat–arched window bays and a centered round-arched entry bay. A gable roof topped with a square wooden cupola covers the front portion of the building. Wrought-iron balustrades with integrated lamp standards flank the stairs.

The entry has double wooden doors each with a molded wooden panel. The window bays, with stone lintels and sills, each contain double-hung wood sash with twelve-over-twelve lights. Terminating the first floor is a wooden frieze and dentil cornice. Sloping rearward from the cornice is a copper-clad gable roof topped by a square wooden cupola.

The Camas Main Post Office is significant for its art and its legacy of the Federal Public Works programs of the depression era.

• Listed on the National Register of Historic Places in 1991.