
Diagonal
- County:
- Ringgold County
- County Seat:
- No
- Area (mi²):
- 0.913
- State:
- Iowa
Diagonal is a city located in Ringgold County, Iowa. Diagonal has a 2025 population of 338. Diagonal is currently declining at a rate of 0% annually and its population has decreased by 0% since the most recent census, which recorded a population of 338 in 2020.
The average household income in Diagonal is $72,875 with a poverty rate of 6.35%. The median age in Diagonal is 47.2 years: 40.1 years for males, and 52.3 years for females.