The United States Post Office Watonga, in Watonga, Oklahoma, is a Colonial Revival-style building built in 1936. It was listed on the National Register of Historic Places in 2009. It is a one-and-a-half-story brick-clad building. Its front facade has decorative detail at the front entrance, including a round arch fanlight above, and brickwork suggestive of pilasters by the sidelights of the doorway. It has four nine-over-nine double-hung windows Its lobby has a mural, "Roman Nose Canyon", by artist Edith Mahier.