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Diagonal, Iowa
Diagonal, IA.jpg
Location of Diagonal, Iowa
Location of Diagonal, Iowa
Country  United States
State  Iowa
County Ringgold
Area
 • Total 0.92 sq mi (2.37 km2)
 • Land 0.91 sq mi (2.36 km2)
 • Water 0.00 sq mi (0.00 km2)
Elevation
1,158 ft (353 m)
Population
 (2020)
 • Total 344
 • Density 376.78/sq mi (145.47/km2)
Time zone UTC-6 (Central (CST))
 • Summer (DST) UTC-5 (CDT)
ZIP code
50845
Area code(s) 641
FIPS code 19-21270
GNIS feature ID 0455904

Diagonal is a city in northwest Ringgold County, Iowa, United States. The population was 344 at the time of the 2020 census.

The community was named for the fact that two railroads intersected diagonally near the town site.

Geography

Diagonal is located at 40°48′32″N 94°20′29″W / 40.80889°N 94.34139°W / 40.80889; -94.34139 (40.808819, -94.341510) along the Grand River.

According to the United States Census Bureau, the city has a total area of 0.90 square miles (2.33 km2), all of it land.

Demographics

Historical populations
Year Pop. ±%
1900 383 —    
1910 509 +32.9%
1920 569 +11.8%
1930 577 +1.4%
1940 603 +4.5%
1950 472 −21.7%
1960 443 −6.1%
1970 327 −26.2%
1980 362 +10.7%
1990 298 −17.7%
2000 312 +4.7%
2010 330 +5.8%
2020 344 +4.2%
Source: and Iowa Data Center
Source:
U.S. Decennial Census
DiagonalIowaPopPlot
The population of Diagonal, Iowa from US census data

2010 census

As of the census of 2010, there were 330 people, 119 households, and 71 families living in the city. The population density was 366.7 inhabitants per square mile (141.6/km2). There were 145 housing units at an average density of 161.1 per square mile (62.2/km2). The racial makeup of the city was 97.9% White, 0.3% African American, and 1.8% Native American.

There were 119 households, of which 24.4% had children under the age of 18 living with them, 51.3% were married couples living together, 6.7% had a female householder with no husband present, 1.7% had a male householder with no wife present, and 40.3% were non-families. 37.0% of all households were made up of individuals, and 17.6% had someone living alone who was 65 years of age or older. The average household size was 2.13 and the average family size was 2.79.

The median age in the city was 52.8 years. 15.8% of residents were under the age of 18; 6.3% were between the ages of 18 and 24; 16.9% were from 25 to 44; 24.9% were from 45 to 64; and 36.1% were 65 years of age or older. The gender makeup of the city was 45.2% male and 54.8% female.

Notable people

  • Dick Ives, University of Iowa Three Time All American basketball player
  • Yam Yaryan, Chicago White Sox MLB baseball player, grew up near Diagonal
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