Diagonal is a city in Ringgold County, Iowa, home to about 454 people across 0.9 square miles. Its ZIP code is 50845.
Mostly Diagonal
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| Nearest major airport | Des Moines International Airport (DSM)61 miles away |
|---|---|
| Nearest city of 250,000+ | Omaha, NE94 miles away |
| Nearest city of 1 million+ | Chicago, IL353 miles away |
Straight-line distances from the center of Diagonal; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Diagonal had 344 residents in the 2020 census, up 10% since 2000.
It’s the 490th largest of 1,019 towns in Iowa by population.
Ringgold County grew from 15,325 residents in 1900 to 4,663 in 2020.
Ringgold County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 85°F in summer, and winter lows average 12°F. About 37.1 inches of rain and melted snow fall in a typical year, with about 21 inches of snow.
Source: NOAA 1991–2020 climate normals, Mt Ayr, IA weather station (10 miles away).
1,112 jobs at 131 businesses in Ringgold County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
1 doctors and other health care providers list an office in Diagonal.
Nearest hospitals
Providers with an office here
| Mental health providers | 1 |
|---|
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (1 nearby)
Museums
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Diagonal Comm School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Diagonal Elementary SchoolDiagonal | Pre-K–5 | 58 | Public | 1.2 mi |
| Diagonal Junior-Senior High SchoolDiagonal | 6–12 | 52 | Public | 1.2 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.