Demographics of Grundy County, Iowa

Grundy County, Iowa had 12,361 people on July 1, 2025, by the Census Bureau’s estimate: +24 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Grundy County, in four figures

12,361
Population: July 1, 2025, Vintage 2025 estimate.; +0.2%
Change since July 2020: +24 people.; 41.9 ±0.6
Median age: ACS 2020–⁠2024.; $87,205 ±$4,831
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Grundy County, Iowa's population grew 0.2% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Grundy County, Iowa's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

Source: The Census Bureau

About this chart

The figures

Grundy County, Iowa's population grew 0.2% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Grundy County, Iowa's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	12,337	100.0	100.0
2021	12,365	100.2	100.2
2022	12,367	100.2	100.7
2023	12,383	100.4	101.6
2024	12,372	100.3	102.5
2025	12,361	100.2	103.1

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Population of Grundy County, Iowa on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	12,337	+6	+1	0	+3
2021	12,365	+28	−43	+6	+54
2022	12,367	+2	−11	+6	+9
2023	12,383	+16	−32	+17	+33
2024	12,372	−11	−7	+23	−27
2025	12,361	−11	−11	+18	−19

Age, 2020–2024

The median age is 41.9 ±0.6: for men 41.0 ±0.7 and for women 42.7 ±0.8. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Grundy County by age, ACS 2020–2024
Age	People	Share	Iowa	United States
Under 5	706 ±25	5.7% ±0.2	5.9% ±<0.1	5.6% ±<0.1
5 to 17	2,199 ±119	17.8% ±1.0	17.0% ±0.1	16.3% ±<0.1
18 to 24	836 ±101	6.8% ±0.8	10.0% ±0.1	9.1% ±<0.1
25 to 44	2,917 ±112	23.6% ±0.9	25.1% ±0.1	26.9% ±<0.1
45 to 64	3,126 ±153	25.2% ±1.2	23.9% ±0.1	24.8% ±<0.1
65 and over	2,600 ±185	21.0% ±1.5	18.1% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $87,205 ±$4,831, and income per person $42,005 ±$2,239, in 2024 dollars. The median is $75,059 ±$418 in Iowa and $80,734 ±$166 in the United States.

Households by income

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Households in Grundy County by income, ACS 2020–2024
Household income	Households	Share	Iowa	United States
Under $25,000	563 ±112	11.0% ±2.2	13.9% ±0.2	14.6% ±<0.1
$25,000 to $49,999	827 ±120	16.2% ±2.3	18.5% ±0.3	16.7% ±<0.1
$50,000 to $74,999	810 ±115	15.8% ±2.2	17.5% ±0.3	15.5% ±<0.1
$75,000 to $99,999	825 ±106	16.1% ±2.1	14.0% ±0.3	12.6% ±<0.1
$100,000 to $149,999	1,147 ±139	22.4% ±2.7	18.7% ±0.3	17.5% ±<0.1
$150,000 to $199,999	495 ±95	9.7% ±1.8	8.8% ±0.2	9.6% ±<0.1
$200,000 or more	450 ±101	8.8% ±2.0	8.6% ±0.2	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Grundy County by age, ACS 2020–2024
Age	Below poverty	Rate	Iowa	United States
All ages	798 ±174	6.5% ±1.4	11.1% ±0.2	12.5% ±0.1
Under 18	173 ±63	6.0% ±2.2	12.9% ±0.3	16.1% ±0.1
18 to 59	402 ±112	6.8% ±1.9	11.4% ±0.3	11.6% ±0.1
60 and over	223 ±64	6.5% ±1.8	8.8% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Grundy County, ACS 2020–2024
Measure	Grundy County	Iowa	United States
Housing units	5,498 ±31	1,437,699 ±523	143,775,355 ±10,234
Occupied	93.1% ±1.6	91.5% ±0.3	89.9% ±0.1
Vacant	6.9% ±1.6	8.5% ±0.3	10.1% ±0.1
Owner occupied	84.5% ±1.9	71.7% ±0.3	65.2% ±0.3
Renter occupied	15.5% ±2.1	28.3% ±0.3	34.8% ±0.1
Median home value	$198,800 ±$10,465	$208,000 ±$1,141	$332,700 ±$236
Median gross rent	$774 ±$53	$972 ±$6	$1,413 ±$2
Median year built	1962 ±4	1972 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Grundy County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Iowa	United States
Hispanic or Latino	219 ±0	1.8% ±<0.1	7.3% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	11,749 ±87	94.9% ±0.7	82.3% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	71 ±31	0.6% ±0.3	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	59 ±10	0.5% ±0.1	2.5% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	18 to 98	0.1% to 0.8%	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 16	0% to 0.1%	0.2% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	12 to 178	0.1% to 1.4%	0.3% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	133 ±60	1.1% ±0.5	3.5% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Grundy County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Iowa	United States
Born in the state	10,714 ±173	86.5% ±1.4	69.6% ±0.2	57.3% ±<0.1
Born in another state	1,430 ±168	11.5% ±1.4	23.8% ±0.2	26.9% ±<0.1
Born a citizen outside the states	2 to 50	< 0.1% to 0.4%	0.7% ±<0.1	1.7% ±<0.1
Born abroad	214 ±45	1.7% ±0.4	5.9% ±0.1	14.1% ±<0.1
Naturalized citizens	56 ±25	0.5% ±0.2	2.6% ±0.1	7.4% ±<0.1
Not citizens	158 ±53	1.3% ±0.4	3.3% ±0.1	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Grundy County among the counties of Iowa

60th of 99 by population, July 2025. Every one is listed on the Iowa page.

Counties of Iowa near Grundy County in population, July 2025
County	July 2025	Change since 2020
Allamakee County	14,238	+1.2%
O'Brien County	14,220	+0.5%
Butler County	14,049	−2.0%
Cass County	12,960	−1.2%
Wright County	12,801	−0.9%
Grundy County	12,361	+0.2%
Lyon County	12,354	+3.6%
Appanoose County	12,077	−1.7%
Union County	11,829	−2.5%
Shelby County	11,689	−0.2%
Chickasaw County	11,663	−2.8%

Elsewhere on the site

Rankings this appears in

No. 1 Counties in Iowa by homeownership rate
No. 2 Counties in Iowa by median household income
No. 4 Counties in Iowa by per capita income
No. 18 Counties in Iowa by median home value
No. 20 Counties by homeownership rate
No. 29 Counties in Iowa by median rent

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Compiled automatically from Census Bureau population estimates — counties and Puerto Rico municipios, with components of change and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026