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
Homeownership is the standout figure in Grundy County: 84.0% of homes are owner-occupied, higher than the national rate. Grundy County is a county in Iowa with a population of 12,352.
Households take in a median $83,617, comfortably above the US median of $78,538. Very few residents live in poverty — 4.1%, below the national 12.4%. Homes carry a median value of $180,500, with typical rent around $777.
Degree attainment is mid-range for US counties: 24.7% of adults hold a four-year degree, below the national 35.0%. Remote work is below the national 14.0% at 9.9%, and the average commute runs about 22 minutes each way.
The ownership rate anchors the housing story in Grundy County, and tends to move with the age structure and home-value figures above.
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
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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.
Grundy County, IA Climate
Grundy County, IA has an average annual temperature of 8.3°C (47°F) and receives about 853 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
8.3°C
Avg Temp
853
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -9° / 16° | 22 mm |
| February | -5° / 22° | 25 mm |
| March | 1° / 34° | 56 mm |
| April | 9° / 48° | 81 mm |
| May | 16° / 60° | 105 mm |
| June | 21° / 70° | 117 mm |
| July | 23° / 73° | 114 mm |
| August | 21° / 70° | 101 mm |
| September | 17° / 63° | 88 mm |
| October | 10° / 50° | 67 mm |
| November | 2° / 35° | 45 mm |
| December | -6° / 21° | 32 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Grundy County, IA
The most comfortable months to visit Grundy County, IA are typically August, June and July, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 29°C high). The coldest is January (near -14°C low). June is usually the wettest month.
Where to stay near Grundy County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.