• county
  • FIPS 19125
  • Largest town: Pella

Marion County, Iowa

Marion County had 34,048 residents in the Census Vintage 2024 estimate, on 554.5 square miles of land. It ranks 21st of 99 in Iowa by population and 61st by land area.

Population
34,048
#21 of 99 in Iowa · #1,339 in US
Area
554.5 sq mi
#61 of 99 in Iowa · #1,873 in US
Density
61 / sq mi
#19 of 99 in Iowa · #1,286 in US
Median household income
$79,709
#11 of 99 in Iowa · #485 in US

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

Marion County within Iowa. Pin: Des Moines.

Measure from here

Tools and pages that start from Marion County

Marion County population, land area and income

Marion County had 34,048 residents in the Census Vintage 2024 estimate, on 554.5 square miles of land. It ranks 21st of 99 in Iowa by population and 61st by land area. That works out to 61.4 people per square mile, below the US average of 96.3, and above the national county median.

The median county-equivalent in Iowa has 15,008 residents, so Marion County is 2.3 times that size.

Its SAIPE 2023 median household income of $79,709 is in the top quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

34,048

3144th1st

1339th of 3,144 (US)

Land area

554 sq mi

3144th1st

1873rd of 3,144 (US)

Density

61.4 / sq mi

3144th1st

1286th of 3,144 (US)

Median household income

$79,709

3143rd1st

485th of 3,143 (US)

Rank within Iowa (99)

Population

34,048

99th1st

21st of 99 (IA)

Land area

554 sq mi

99th1st

61st of 99 (IA)

Density

61.4 / sq mi

99th1st

19th of 99 (IA)

Median household income

$79,709

99th1st

11th of 99 (IA)

How Marion County's population changed since 2020

Marion County gained 634 residents between the July 2020 and July 2024 estimates, a rise of 1.9%. That ranks 11th 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, Marion County recorded 1,418 births and 1,597 deaths, a natural change of -179. Net international migration added +121 and net domestic migration, people moving to or from other US counties, came to +695. The largest single component was domestic migration, which added 695 people.

33.4k202033.5k202133.6k202233.7k202334.0k2024
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
1,418
Deaths
1,597
Net international migration
+121
Net domestic migration
+695
Change, July 2023 to July 2024
+330

Where Marion County is

The Census internal point of Marion County is at 41.331400, -93.093900. 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 Marion 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: Marion County internal point. Dark pin: Des Moines.

Internal point

Decimal
41.331400, -93.093900
DMS
41°19'53.04"N 93°05'38.04"W
UTM
15N 492142.6E 4575550.9N
Geohash
9zmg1s5hf
Plus code
86H88WJ4+HC

Towns in Marion County

4 incorporated places of 1,000+ people have residents in Marion County, 21,293 people together, or 63% of the county. Each figure counts only the part of the town inside Marion County; towns marked "part" extend into another county. The largest is Pella with 10,964.

  1. 01Pella (part)10,964
  2. 02Knoxville7,440
  3. 03Pleasantville1,696
  4. 04Melcher-Dallas1,193
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Marion County

The Census 2024 county adjacency file lists 6 neighbors for Marion County. The most populous is Polk County, IA, with 516,185 residents. Distances run between Census internal points in a straight line.

Distance to Des Moines and the nearest big city

Des Moines is 31.9 miles NW of Marion County's internal point in a straight line. The nearest place of 100,000 or more is Des Moines, IA (population 213,096), 31.5 miles away. The nearest place of 10,000 or more is Pella, IA (population 10,965), 10.4 miles away.

Marion County FIPS code

The FIPS code of Marion County is 19125: state code 19 for Iowa plus county code 125. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $79,709.

Questions people ask

What is the population of Marion County, Iowa?

The Census Vintage 2024 estimate for July 1, 2024 is 34,048. That is up 634 people (1.9%) from the July 2020 estimate of 33,414.

What is the FIPS code of Marion County?

19125. The first two digits (19) are Iowa; the last three (125) identify the county.

What is the largest town in Marion County?

Pella, with 10,964 residents inside Marion County in 2024 (10,965 across all 2 counties it spans).

Which counties border Marion County?

6 county-equivalents border it in the Census 2024 adjacency file: Polk County, IA; Warren County, IA; Jasper County, IA; Mahaska County, IA; Lucas County, IA; Monroe 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.