Park Addition School, Prairie School building in Cheyenne, Wyoming

Park Addition School is a school building in Cheyenne designed with the horizontal lines and natural materials of early 20th-century Prairie architecture. The structure features large windows that bring natural light into classrooms and preserves the original construction methods of this architectural style.

Built in 1921 to a design by architect Frederick Hutchinson Porter, the Park Addition School gained an addition during the 1947–1949 school year and was renamed Chaplin School for principal Ruth Chaplin. A separate Chaplin Annex, finished in 1953 and enlarged in 1956, outgrew the original, which then housed school administrative offices. The district sold the building in 1977, and it was listed on the National Register of Historic Places in 2005.

The building's name changed with its role: it became Chaplin School in honour of principal Ruth Chaplin, who led it from its opening until the 1952–1953 year. After the annex in Pioneer Park outgrew the original structure, the older building was kept for school administrative offices.

The building at 1100 Richardson Court is privately owned and was converted to a childcare center in the early 1980s, so it is not a public school with tours. View the Prairie School exterior from the street; interior access depends on the current owner and restoration work reported for 2016–2017.

The building displays characteristic Prairie School features including extended roof overhangs and geometric patterns in its design. These details show how this American architectural movement influenced school construction throughout the western states.