Diagonal Community School
- Contains handbook, calendar, athletic schedules, weekly announcements, photographs, student projects and podcasts.
- http://www.diagonal.k12.ia.us/

United Church of Diagonal
- Worship schedule, staff directory, church history and information about ministries and missions.
- http://www.diagonalchurch.com/

City-Data.com: Diagonal, 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/Diagonal-Iowa.html

Wikipedia: Diagonal, Iowa
- Encyclopedia article covers geography and demographics of this community in Ringgold County.
- http://en.wikipedia.org/wiki/Diagonal,_Iowa

Cedars Edge Llama Farm
- Raising llamas and alpacas for breeding stock, wool production, guard animals and companions. Also offer herd management, auction preparation, transport and stud service. Includes contact information.
- http://www.mddc.com/montana/cedar/index/