Post Office: Promise City, Iowa
- Features June, 2004 photograph from the collection of the Post Mark Collectors Club.
- http://www.postmarks.org/pop/3500/3571.htm

City-Data.com: Promise City, Iowa
- Profiles housing, population demographics, jobs, weather and climate tables. Contains a list of area hospitals, schools, airports, radio and TV broadcast stations, photographs and maps.
- http://www.city-data.com/city/Promise-City-Iowa.html

Wikipedia: Promise City, Iowa
- Encyclopedia article features geography and demographics of this community in Wayne County.
- http://en.wikipedia.org/wiki/Promise_City,_Iowa