Delaware County
County
Delaware County Courthouse
Delaware County Courthouse
Map of Iowa highlighting Delaware County
Location within the U.S. state of Iowa
Map of the United States highlighting Iowa
Iowa's location within the U.S.
Coordinates: 42°28′10″N 91°22′13″W / 42.469444444444°N 91.370277777778°W / 42.469444444444; -91.370277777778
Country United States
State Iowa
Founded1837
Named forState of Delaware
SeatManchester
Largest cityManchester
Area
 • Total579 sq mi (1,500 km2)
 • Land578 sq mi (1,500 km2)
 • Water1.2 sq mi (3 km2)  0.2%
Population
 (2020)
 • Total17,488
 • Density30/sq mi (12/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district1st
Websitedelawarecounty.iowa.gov

Delaware County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 17,488.[1] The county seat is Manchester.[2] The county takes its name after the U.S. state of Delaware.

Geography

A farm near Hopkinton

According to the U.S. Census Bureau, the county has a total area of 579 square miles (1,500 km2), of which 578 square miles (1,500 km2) is land and 1.2 square miles (3.1 km2) (0.2%) is water.[3] It has a rough hilly surface.[4]

Major highways

Adjacent counties

Demographics

Historical population
CensusPop.Note%±
18501,759—
186011,024526.7%
187017,43258.1%
188017,9503.0%
189017,349−3.3%
190019,18510.6%
191017,888−6.8%
192018,1831.6%
193018,122−0.3%
194018,4872.0%
195017,734−4.1%
196018,4834.2%
197018,7701.6%
198018,9330.9%
199018,035−4.7%
200018,4042.0%
201017,764−3.5%
202017,488−1.6%
U.S. Decennial Census[5]
1790-1960[6] 1900-1990[7]
1990-2000[8] 2010-2018[9]
Population of Delaware County from US census data

2020 census

The 2020 census recorded a population of 17,488 in the county, with a population density of 30.1958/sq mi (11.6587/km2). 97.75% of the population reported being of one race. 94.60% were non-Hispanic White, 0.70% were Black, 1.40% were Hispanic, 0.29% were Native American, 0.27% were Asian, 0.01% were Native Hawaiian or Pacific Islander and 2.74% were some other race or more than one race. There were 8,100 housing units of which 7,141 were occupied.[1]

2010 census

The 2010 census recorded a population of 17,764 in the county, with a population density of 30.7415/sq mi (11.8694/km2). There were 8,028 housing units, of which 7,062 were occupied.[10]

2000 census

2000 Census Age Pyramid for Delaware County

As of the census[11] of 2000, there were 18,404 people, 6,834 households, and 5,029 families residing in the county. The population density was 32 people per square mile (12 people/km2). There were 7,682 housing units at an average density of 13 units per square mile (5.0 units/km2). The racial makeup of the county was 99.28% White, 0.07% Black or African American, 0.10% Native American, 0.14% Asian, 0.01% Pacific Islander, 0.10% from other races, and 0.30% from two or more races. 0.66% of the population were Hispanic or Latino of any race.

There were 6,834 households, out of which 36.70% had children under the age of 18 living with them, 64.10% were married couples living together, 6.20% had a female householder with no husband present, and 26.40% were non-families. 23.00% of all households were made up of individuals, and 11.20% had someone living alone who was 65 years of age or older. The average household size was 2.66 and the average family size was 3.15.

In the county, the population was spread out, with 29.00% under the age of 18, 7.00% from 18 to 24, 27.60% from 25 to 44, 21.50% from 45 to 64, and 15.00% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 98.40 males. For every 100 females age 18 and over, there were 96.60 males.

The median income for a household in the county was $37,168, and the median income for a family was $43,607. Males had a median income of $30,712 versus $19,685 for females. The per capita income for the county was $17,327. About 6.30% of families and 7.90% of the population were below the poverty line, including 8.50% of those under age 18 and 9.80% of those age 65 or over.

Communities

Cities

Townships

Delaware County is divided into these townships:

Unincorporated Communities

Population ranking

The population ranking of the following table is based on the 2020 census of Delaware County.[1]

† county seat

Rank City/Town/etc. Municipal type Population (2020 Census)
1 † Manchester City 5,065
2 Dyersville (mostly in Dubuque County) City 4,477
3 Edgewood (partially in Clayton County) City 909
4 Earlville City 716
5 Hopkinton City 622
6 Delhi City 420
7 Colesburg City 386
8 Ryan City 350
9 Greeley City 217
10 Dundee City 198
11 Delaware City 142
12 Masonville City 99

Politics

United States presidential election results for Delaware County, Iowa[12]
Year Republican Democratic Third party
No. %No. %No. %
2020 6,666 66.64% 3,157 31.56% 180 1.80%
2016 5,694 61.62% 2,957 32.00% 590 6.38%
2012 4,636 49.43% 4,616 49.22% 126 1.34%
2008 4,113 46.20% 4,649 52.22% 141 1.58%
2004 4,908 53.35% 4,227 45.95% 65 0.71%
2000 4,273 51.18% 3,808 45.61% 268 3.21%
1996 3,065 40.88% 3,704 49.41% 728 9.71%
1992 3,195 37.62% 3,093 36.42% 2,204 25.95%
1988 3,425 46.08% 3,947 53.11% 60 0.81%
1984 4,769 59.61% 3,158 39.47% 74 0.92%
1980 4,316 55.38% 2,671 34.27% 807 10.35%
1976 4,161 55.62% 3,168 42.35% 152 2.03%
1972 4,848 61.21% 2,944 37.17% 128 1.62%
1968 4,650 59.39% 2,760 35.25% 419 5.35%
1964 3,427 42.49% 4,623 57.32% 15 0.19%
1960 5,015 57.62% 3,688 42.38% 0 0.00%
1956 5,732 68.49% 2,621 31.32% 16 0.19%
1952 6,449 73.20% 2,351 26.69% 10 0.11%
1948 4,555 60.75% 2,876 38.36% 67 0.89%
1944 5,164 67.22% 2,498 32.52% 20 0.26%
1940 6,175 67.30% 2,985 32.53% 16 0.17%
1936 4,483 49.56% 4,350 48.09% 213 2.35%
1932 4,088 46.70% 4,559 52.08% 107 1.22%
1928 5,390 63.74% 3,043 35.99% 23 0.27%
1924 4,938 64.68% 1,146 15.01% 1,551 20.31%
1920 5,880 82.96% 1,111 15.67% 97 1.37%
1916 2,827 66.78% 1,332 31.47% 74 1.75%
1912 1,394 34.30% 1,399 34.42% 1,271 31.27%
1908 2,396 60.35% 1,471 37.05% 103 2.59%
1904 2,726 67.04% 1,236 30.40% 104 2.56%
1900 2,805 63.02% 1,570 35.27% 76 1.71%
1896 2,799 60.52% 1,778 38.44% 48 1.04%

See also

References

  1. 1 2 3 "2020 Census State Redistricting Data". census.gov. United states Census Bureau. Retrieved August 12, 2021.
  2. ↑ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
  3. ↑ "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. February 12, 2011. Retrieved April 23, 2011.
  4. ↑ Ripley, George; Dana, Charles A., eds. (1879). "Delaware, the name of five counties in the United States. V. An E. county of Iowa" . The American Cyclopædia.
  5. ↑ "U.S. Decennial Census". United States Census Bureau. Retrieved July 16, 2014.
  6. ↑ "Historical Census Browser". University of Virginia Library. Retrieved July 16, 2014.
  7. ↑ "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved July 16, 2014.
  8. ↑ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Archived (PDF) from the original on March 27, 2010. Retrieved July 16, 2014.
  9. ↑ "State & County QuickFacts". United States Census Bureau. Archived from the original on June 7, 2011. Retrieved July 16, 2014.
  10. ↑ "Population & Housing Occupancy Status 2010" (PDF). United States Census Bureau American FactFinder. Archived (PDF) from the original on October 16, 2020. Retrieved August 15, 2022.
  11. ↑ "U.S. Census website". United States Census Bureau. Retrieved January 31, 2008.
  12. ↑ Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved April 25, 2018.
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