Caddoa is an extinct town located in Bent County, Colorado, United States. The community took its name from nearby Caddoa Creek.
The Caddoa post office operated from November 7, 1881, until March 7, 1958. The U.S. Post Office at Hasty (ZIP Code 81044) now serves the Caddoa area.
Caddoa District, from the construction of John Martin Reservoir, moved to Caddoa from the Tucumcari District after the Conchas Project finished.