• county
  • FIPS 19075
  • Largest town: Grundy Center

Grundy County, Iowa

Grundy County had 12,405 residents in the Census Vintage 2024 estimate, on 501.9 square miles of land. It ranks 60th of 99 in Iowa by population and 71st by land area.

Population
12,405
#60 of 99 in Iowa · #2,260 in US
Area
501.9 sq mi
#71 of 99 in Iowa · #2,072 in US
Density
25 / sq mi
#54 of 99 in Iowa · #2,071 in US
Median household income
$81,093
#7 of 99 in Iowa · #439 in US

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

Grundy County within Iowa. Pin: Des Moines.

Measure from here

Tools and pages that start from Grundy County

Grundy County population, land area and income

Grundy County had 12,405 residents in the Census Vintage 2024 estimate, on 501.9 square miles of land. It ranks 60th of 99 in Iowa by population and 71st by land area. That works out to 24.7 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; Grundy County is somewhat smaller.

Its SAIPE 2023 median household income of $81,093 is in the top quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

12,405

3144th1st

2260th of 3,144 (US)

Land area

502 sq mi

3144th1st

2072nd of 3,144 (US)

Density

24.7 / sq mi

3144th1st

2071st of 3,144 (US)

Median household income

$81,093

3143rd1st

439th of 3,143 (US)

Rank within Iowa (99)

Population

12,405

99th1st

60th of 99 (IA)

Land area

502 sq mi

99th1st

71st of 99 (IA)

Density

24.7 / sq mi

99th1st

54th of 99 (IA)

Median household income

$81,093

99th1st

7th of 99 (IA)

How Grundy County's population changed since 2020

Grundy County gained 58 residents between the July 2020 and July 2024 estimates, a rise of 0.5%. That ranks 34th 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, Grundy County recorded 578 births and 663 deaths, a natural change of -85. Net international migration added +75 and net domestic migration, people moving to or from other US counties, came to +70. The largest single component was natural change, which removed 85 people.

12.3k202012.4k202112.4k202212.4k202312.4k2024
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
578
Deaths
663
Net international migration
+75
Net domestic migration
+70
Change, July 2023 to July 2024
-7

Where Grundy County is

The Census internal point of Grundy County is at 42.403300, -92.790200. 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 Grundy 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: Grundy County internal point. Dark pin: Des Moines.

Internal point

Decimal
42.403300, -92.790200
DMS
42°24'11.88"N 92°47'24.72"W
UTM
15N 517265.0E 4694577.1N
Geohash
9zw10x21p
Plus code
86J9C635+8W

Towns in Grundy County

4 incorporated places of 1,000+ people have residents in Grundy County, 6,885 people together, or 56% of the county. Each figure counts only the part of the town inside Grundy County; towns marked "part" extend into another county. The largest is Grundy Center with 2,821.

  1. 01Grundy Center2,821
  2. 02Reinbeck1,673
  3. 03Dike1,293
  4. 04Conrad1,098
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Grundy County

The Census 2024 county adjacency file lists 6 neighbors for Grundy County. The most populous is Black Hawk County, IA, with 132,348 residents. Distances run between Census internal points in a straight line.

Distance to Des Moines and the nearest big city

Des Moines is 70.0 miles SW of Grundy County's internal point in a straight line. The nearest place of 100,000 or more is Cedar Rapids, IA (population 137,904), 64.4 miles away. The nearest place of 10,000 or more is Cedar Falls, IA (population 41,417), 18.9 miles away.

Grundy County FIPS code

The FIPS code of Grundy County is 19075: state code 19 for Iowa plus county code 075. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $81,093.

Questions people ask

What is the population of Grundy County, Iowa?

The Census Vintage 2024 estimate for July 1, 2024 is 12,405. That is up 58 people (0.5%) from the July 2020 estimate of 12,347.

What is the FIPS code of Grundy County?

19075. The first two digits (19) are Iowa; the last three (075) identify the county.

What is the largest town in Grundy County?

Grundy Center, with 2,821 residents inside Grundy County in 2024.

Which counties border Grundy County?

6 county-equivalents border it in the Census 2024 adjacency file: Black Hawk County, IA; Marshall County, IA; Tama County, IA; Hardin County, IA; Butler County, IA; Franklin 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.