• county
  • FIPS 19127
  • Largest town: Marshalltown

Marshall County, Iowa

Marshall County had 40,392 residents in the Census Vintage 2024 estimate, on 572.5 square miles of land. It ranks 15th of 99 in Iowa by population and 43rd by land area.

Population
40,392
#15 of 99 in Iowa · #1,183 in US
Area
572.5 sq mi
#43 of 99 in Iowa · #1,751 in US
Density
71 / sq mi
#16 of 99 in Iowa · #1,177 in US
Median household income
$64,005
#73 of 99 in Iowa · #1,456 in US

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

Marshall County within Iowa. Pin: Des Moines.

Measure from here

Tools and pages that start from Marshall County

Marshall County population, land area and income

Marshall County had 40,392 residents in the Census Vintage 2024 estimate, on 572.5 square miles of land. It ranks 15th of 99 in Iowa by population and 43rd by land area. That works out to 70.6 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 Marshall County is 2.7 times that size.

Its SAIPE 2023 median household income of $64,005 is above the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

40,392

3144th1st

1183rd of 3,144 (US)

Land area

573 sq mi

3144th1st

1751st of 3,144 (US)

Density

70.6 / sq mi

3144th1st

1177th of 3,144 (US)

Median household income

$64,005

3143rd1st

1456th of 3,143 (US)

Rank within Iowa (99)

Population

40,392

99th1st

15th of 99 (IA)

Land area

573 sq mi

99th1st

43rd of 99 (IA)

Density

70.6 / sq mi

99th1st

16th of 99 (IA)

Median household income

$64,005

99th1st

73rd of 99 (IA)

How Marshall County's population changed since 2020

Marshall County gained 301 residents between the July 2020 and July 2024 estimates, a rise of 0.8%. That ranks 28th 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, Marshall County recorded 2,037 births and 2,325 deaths, a natural change of -288. Net international migration added +1,404 and net domestic migration, people moving to or from other US counties, came to -834. The largest single component was international migration, which added 1,404 people.

40.1k202039.9k202139.9k202240.2k202340.4k2024
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
2,037
Deaths
2,325
Net international migration
+1,404
Net domestic migration
-834
Change, July 2023 to July 2024
+162

Where Marshall County is

The Census internal point of Marshall County is at 42.041700, -92.981400. 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 Marshall 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: Marshall County internal point. Dark pin: Des Moines.

Internal point

Decimal
42.041700, -92.981400
DMS
42°02'30.12"N 92°58'53.04"W
UTM
15N 501539.4E 4654406.3N
Geohash
9zmzhjmn8
Plus code
86J922R9+MC

Towns in Marshall County

2 incorporated places of 1,000+ people have residents in Marshall County, 29,289 people together, or 73% of the county. Each figure counts only the part of the town inside Marshall County; towns marked "part" extend into another county. The largest is Marshalltown with 27,886.

  1. 01Marshalltown27,886
  2. 02State Center1,403
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Marshall County

The Census 2024 county adjacency file lists 6 neighbors for Marshall County. The most populous is Story County, IA, with 102,498 residents. Distances run between Census internal points in a straight line.

Distance to Des Moines and the nearest big city

Des Moines is 44.7 miles SW of Marshall County's internal point in a straight line. The nearest place of 100,000 or more is Des Moines, IA (population 213,096), 45.8 miles away. The nearest place of 10,000 or more is Marshalltown, IA (population 27,886), 3.9 miles away.

Marshall County FIPS code

The FIPS code of Marshall County is 19127: state code 19 for Iowa plus county code 127. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $64,005.

Questions people ask

What is the population of Marshall County, Iowa?

The Census Vintage 2024 estimate for July 1, 2024 is 40,392. That is up 301 people (0.8%) from the July 2020 estimate of 40,091.

What is the FIPS code of Marshall County?

19127. The first two digits (19) are Iowa; the last three (127) identify the county.

What is the largest town in Marshall County?

Marshalltown, with 27,886 residents inside Marshall County in 2024.

Which counties border Marshall County?

6 county-equivalents border it in the Census 2024 adjacency file: Story County, IA; Jasper County, IA; Poweshiek County, IA; Tama County, IA; Hardin County, IA; Grundy 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.