Grundy County, Iowa Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 60th-largest in Iowa
The population of Grundy County, Iowa is 12,352 as of the 2023 American Community Survey, making it the 60th-largest county in Iowa. The median household income is $83,617, the median home value is $180,500, and the median age is 41.5.
The population of Grundy County has declined 0.5% since 2010 (12,464 → 12,405), a -0.03% annualized rate.
12,352
Population
-0.03%
Annual growth
25
People / sq mi
$83,617
Median Income
$180,500
Median Home Value
Grundy County covers 502 sq mi of land at 24.6 people per square mile.
About Grundy County, IA
Grundy County is a county in Iowa with a population of 12,352. It ranks #60 among counties in Iowa by population. The median age is 41.5, older than the national median. The population is 49.7% male and 50.3% female.
The median household income in Grundy County is $83,617, above the US median of $74,580. 4.1% of residents live below the federal poverty level. Home values sit at a median of $180,500, with monthly rent averaging $777. The homeownership rate of 84.0% is higher than the national rate of 64.8%.
Educational attainment in Grundy County reflects 24.7% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 9.9% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 22.0 minutes each way.
Grundy County Population History (2010-2024)
The county of Grundy County had a population of 12,464 in 2010 and 12,405 in 2024, a -0.5% growth over 14 years. The peak was 12,478 in 2011. Average annual growth rate: -0.03%.
12,405
Population (2024)
12,464
Population (2010)
12,478
Peak (2011)
-0.03%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 12,464 |
| 2011 | 12,478 |
| 2012 | 12,437 |
| 2013 | 12,340 |
| 2014 | 12,388 |
| 2015 | 12,402 |
| 2016 | 12,303 |
| 2017 | 12,296 |
| 2018 | 12,268 |
| 2019 | 12,227 |
| 2020 | 12,347 |
| 2021 | 12,376 |
| 2022 | 12,379 |
| 2023 | 12,412 |
| 2024 | 12,405 |
Race & Ethnicity
| White | 96.1% |
| Black or African American | 0.7% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.4% |
| Two or More Races | 0.0% |
Age & Sex
41.5
Median Age
50.3%
Female
49.7%
Male
20.8%
Age 65+
Age Distribution
Children (under 15): 19.4% · Seniors (65+): 20.8%
Income & Poverty
| Median household income | $83,617+$10,470 vs state |
| Mean household income | $95,092 |
| Per-capita income | $39,565 |
| Poverty rate | 4.1%-2.8% vs state |
| Unemployment rate | 1.5% |
| Employment-to-population | 65.0% |
Top Industries by Employment
The largest employment sector in Grundy County is professional & business services, accounting for 28.5% of workers.
How residents commute
0.2%
Drive alone
1.8%
Carpool
83.2%
Public transit
9.9%
Work from home
22.0 min
Avg commute
Housing
$180,500$-15,400 vs state
Median home value
$777
Median rent
84.0%
Homeownership rate
5,489
Total housing units
92.6%
Occupied
7.4%
Vacant
16.0%
Renter-occupied
Social & access
97.4%
With health insurance
91.9%
With broadband internet
12.7%
Foreign-born
6.5%
Veterans (18+)
11.1%
With a disability
98.3%
Speak language other than English at home
Education
97.2%
High School+
24.7%
Bachelor's+
Largest cities in Iowa
Other counties in Iowa
Part of Iowa
Metro areas in Iowa
County rankings
Frequently Asked Questions
Grundy County, Iowa has a population of 12,352 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 60th-largest county in Iowa. Population density is 25 people per square mile.
The population of Grundy County has declined 0.5% since 2010 (12,464 → 12,405), a -0.03% annualized rate.
The median household income in Grundy County, Iowa is $83,617, with mean (average) household income of $95,092 and per-capita income of $39,565. 4.1% of residents live below the federal poverty level.
In Grundy County, the largest racial and ethnic groups are White (96.1%), Black or African American (0.7%), Hispanic or Latino (0.4%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Grundy County, Iowa is 41.5 years. Residents are 50.3% female and 49.7% male.
The median home value in Grundy County is $180,500 and median monthly rent is $777. 84.0% of occupied housing units are owner-occupied. The county has 5,489 total housing units, 7.4% of which are vacant.
The largest employment sector in Grundy County, Iowa is professional, scientific, and management services, employing 28.5% of workers. The unemployment rate is 1.5%.
Des Moines is among the largest cities associated with Grundy County, Iowa, with a population of 212,464.
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Statewide data for Iowa
Population, race, income, age, and trends across Iowa
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.