• county
  • FIPS 19055
  • Largest town: Manchester

Delaware County, Iowa

Delaware County had 17,609 residents in the Census Vintage 2024 estimate, on 577.7 square miles of land. It ranks 40th of 99 in Iowa by population and 33rd by land area.

Population
17,609
#40 of 99 in Iowa · #1,952 in US
Area
577.7 sq mi
#33 of 99 in Iowa · #1,709 in US
Density
30 / sq mi
#40 of 99 in Iowa · #1,914 in US
Median household income
$69,339
#48 of 99 in Iowa · #1,049 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Delaware County within Iowa. Pin: Des Moines.

Measure from here

Tools and pages that start from Delaware County

Delaware County population, land area and income

Delaware County had 17,609 residents in the Census Vintage 2024 estimate, on 577.7 square miles of land. It ranks 40th of 99 in Iowa by population and 33rd by land area. That works out to 30.5 people per square mile, below the US average of 96.3, and below the national county median.

The median county-equivalent in Iowa has 15,008 residents; Delaware County is somewhat larger.

Its SAIPE 2023 median household income of $69,339 is above the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

17,609

3144th1st

1952nd of 3,144 (US)

Land area

578 sq mi

3144th1st

1709th of 3,144 (US)

Density

30.5 / sq mi

3144th1st

1914th of 3,144 (US)

Median household income

$69,339

3143rd1st

1049th of 3,143 (US)

Rank within Iowa (99)

Population

17,609

99th1st

40th of 99 (IA)

Land area

578 sq mi

99th1st

33rd of 99 (IA)

Density

30.5 / sq mi

99th1st

40th of 99 (IA)

Median household income

$69,339

99th1st

48th of 99 (IA)

How Delaware County's population changed since 2020

Delaware County gained 155 residents between the July 2020 and July 2024 estimates, a rise of 0.9%. That ranks 21st of 99 in Iowa for growth. The median Iowa county changed by -0.6%, and the state as a whole by +1.6%.

Since the April 2020 estimates base, Delaware County recorded 845 births and 838 deaths, a natural change of +7. Net international migration added +21 and net domestic migration, people moving to or from other US counties, came to +105. The largest single component was domestic migration, which added 105 people.

17.5k202017.6k202117.6k202217.6k202317.6k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
845
Deaths
838
Net international migration
+21
Net domestic migration
+105
Change, July 2023 to July 2024
+26

Where Delaware County is

The Census internal point of Delaware County is at 42.473000, -91.366800. It sits in UTM zone 15N. The map shades Iowa's 99 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Delaware County outlined. Dots are towns of 1,000+ people with residents in it.

Monroe County: -2.9%Worth County: -1.7%Buena Vista County: +0.0%Jasper County: +0.8%Van Buren County: -0.0%Hardin County: -2.2%Ida County: -3.1%Marshall County: +0.8%Fayette County: -1.5%Ringgold County: -0.8%Wapello County: +1.0%Webster County: -0.2%Adams County: -2.8%Buchanan County: +0.6%Cerro Gordo County: -1.2%Lucas County: +1.6%Emmet County: -1.9%Floyd County: -3.8%Crawford County: -0.7%Linn County: +0.6%Montgomery County: -2.6%Polk County: +4.7%Cherokee County: +0.0%Bremer County: +1.3%Grundy County: +0.5%Adair County: -0.8%Cedar County: -1.4%Story County: +3.9%Mahaska County: -0.6%Davis County: +0.9%Clay County: +0.8%Johnson County: +4.6%Greene County: -1.0%Palo Alto County: -2.0%Benton County: +1.0%Cass County: -0.7%Wright County: -1.5%Audubon County: -2.1%Henry County: -5.3%Boone County: +0.1%Appanoose County: -1.4%Washington County: +0.4%Chickasaw County: -2.2%Poweshiek County: -0.9%Osceola County: -2.6%Wayne County: +1.8%Mitchell County: +0.4%Jefferson County: +0.5%Union County: -1.4%Butler County: -1.2%Hancock County: -1.3%Marion County: +1.9%Delaware County: +0.9%Humboldt County: +0.2%Sioux County: +1.8%Des Moines County: -1.1%O'Brien County: +0.8%Clayton County: -0.6%Black Hawk County: +1.0%Winnebago County: -2.6%Harrison County: +0.4%Decatur County: -1.0%Pocahontas County: -0.9%Lyon County: +3.8%Iowa County: -1.4%Franklin County: +0.3%Dickinson County: +2.2%Madison County: +3.2%Allamakee County: +0.8%Jones County: +2.2%Carroll County: -1.6%Kossuth County: -2.6%Hamilton County: -1.0%Howard County: -1.4%Page County: -1.1%Guthrie County: +1.5%Tama County: -1.8%Monona County: -3.6%Clarke County: -2.1%Lee County: -3.4%Mills County: +2.1%Sac County: -2.7%Scott County: +0.6%Keokuk County: -1.6%Jackson County: -0.3%Warren County: +7.1%Calhoun County: -1.9%Shelby County: +0.8%Fremont County: -1.1%Dubuque County: -0.1%Louisa County: -1.8%Taylor County: -0.6%Woodbury County: +1.2%Clinton County: -0.9%Winneshiek County: -1.6%Pottawattamie County: -0.1%Plymouth County: +0.5%Muscatine County: -2.4%Dallas County: +14.7%
Change 2020 to 2024
  1. < -1.9%
  2. < -1.0%
  3. < +0.0%
  4. < +0.9%
  5. ≥ +0.9%
no data

Orange pin: Delaware County internal point. Dark pin: Des Moines.

Internal point

Decimal
42.473000, -91.366800
DMS
42°28'22.80"N 91°22'0.48"W
UTM
15N 634253.1E 4703587.3N
Geohash
9zx18guxp
Plus code
86JCFJFM+67

Towns in Delaware County

2 incorporated places of 1,000+ people have residents in Delaware County, 5,592 people together, or 32% of the county. Each figure counts only the part of the town inside Delaware County; towns marked "part" extend into another county. The largest is Manchester with 5,283.

  1. 01Manchester5,283
  2. 02Dyersville (part)309
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Delaware County

The Census 2024 county adjacency file lists 6 neighbors for Delaware County. The most populous is Linn County, IA, with 231,762 residents. Distances run between Census internal points in a straight line.

Distance to Des Moines and the nearest big city

Des Moines is 130.0 miles WSW of Delaware County's internal point in a straight line. The nearest place of 100,000 or more is Cedar Rapids, IA (population 137,904), 38.6 miles away. The nearest place of 10,000 or more is Marion, IA (population 42,542), 31.6 miles away.

Delaware County FIPS code

The FIPS code of Delaware County is 19055: state code 19 for Iowa plus county code 055. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $69,339.

Questions people ask

What is the population of Delaware County, Iowa?

The Census Vintage 2024 estimate for July 1, 2024 is 17,609. That is up 155 people (0.9%) from the July 2020 estimate of 17,454.

What is the FIPS code of Delaware County?

19055. The first two digits (19) are Iowa; the last three (055) identify the county.

What is the largest town in Delaware County?

Manchester, with 5,283 residents inside Delaware County in 2024.

Which counties border Delaware County?

6 county-equivalents border it in the Census 2024 adjacency file: Linn County, IA; Dubuque County, IA; Jones County, IA; Buchanan County, IA; Fayette County, IA; Clayton County, IA.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.