Demographics of Cass County, Iowa

Cass County, Iowa had 12,960 people on July 1, 2025, by the Census Bureau’s estimate: −158 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.

Cass County, in four figures

12,960
Population: July 1, 2025, Vintage 2025 estimate.; −1.2%
Change since July 2020: −158 people.; 43.5 ±0.6
Median age: ACS 2020–⁠2024.; $63,013 ±$3,821
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.

Cass County, Iowa's population shrank 1.2% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Cass 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).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Cass County, Iowa's population shrank 1.2% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Cass 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	13,118	100.0	100.0
2021	13,087	99.8	100.2
2022	13,127	100.1	100.7
2023	13,120	100.0	101.6
2024	13,005	99.1	102.5
2025	12,960	98.8	103.1

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Population of Cass 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	13,118	−11	−22	0	+9
2021	13,087	−31	−86	+1	+43
2022	13,127	+40	−86	+2	+129
2023	13,120	−7	−74	+9	+61
2024	13,005	−115	−82	+13	−44
2025	12,960	−45	−91	+8	+39

Age, 2020–2024

The median age is 43.5 ±0.6: for men 43.1 ±0.8 and for women 44.3 ±1.0. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Cass County by age, ACS 2020–2024
Age	People	Share	Iowa	United States
Under 5	698 ±51	5.3% ±0.4	5.9% ±<0.1	5.6% ±<0.1
5 to 17	2,337 ±188	17.8% ±1.4	17.0% ±0.1	16.3% ±<0.1
18 to 24	837 ±122	6.4% ±0.9	10.0% ±0.1	9.1% ±<0.1
25 to 44	2,886 ±184	22.0% ±1.4	25.1% ±0.1	26.9% ±<0.1
45 to 64	3,277 ±206	25.0% ±1.6	23.9% ±0.1	24.8% ±<0.1
65 and over	3,061 ±232	23.4% ±1.8	18.1% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $63,013 ±$3,821, and income per person $37,667 ±$2,591, 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 Cass County by income, ACS 2020–2024
Household income	Households	Share	Iowa	United States
Under $25,000	1,147 ±194	19.6% ±3.3	13.9% ±0.2	14.6% ±<0.1
$25,000 to $49,999	1,198 ±207	20.5% ±3.5	18.5% ±0.3	16.7% ±<0.1
$50,000 to $74,999	1,016 ±181	17.4% ±3.1	17.5% ±0.3	15.5% ±<0.1
$75,000 to $99,999	635 ±136	10.9% ±2.3	14.0% ±0.3	12.6% ±<0.1
$100,000 to $149,999	1,187 ±190	20.3% ±3.2	18.7% ±0.3	17.5% ±<0.1
$150,000 to $199,999	323 ±106	5.5% ±1.8	8.8% ±0.2	9.6% ±<0.1
$200,000 or more	338 ±113	5.8% ±1.9	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 Cass County by age, ACS 2020–2024
Age	Below poverty	Rate	Iowa	United States
All ages	1,833 ±366	14.3% ±2.8	11.1% ±0.2	12.5% ±0.1
Under 18	642 ±176	21.3% ±5.5	12.9% ±0.3	16.1% ±0.1
18 to 59	757 ±167	12.5% ±2.7	11.4% ±0.3	11.6% ±0.1
60 and over	434 ±118	11.5% ±3.0	8.8% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Cass County, ACS 2020–2024
Measure	Cass County	Iowa	United States
Housing units	6,393 ±24	1,437,699 ±523	143,775,355 ±10,234
Occupied	91.4% ±2.0	91.5% ±0.3	89.9% ±0.1
Vacant	8.6% ±2.0	8.5% ±0.3	10.1% ±0.1
Owner occupied	71.6% ±3.3	71.7% ±0.3	65.2% ±0.3
Renter occupied	28.4% ±2.9	28.3% ±0.3	34.8% ±0.1
Median home value	$150,300 ±$10,147	$208,000 ±$1,141	$332,700 ±$236
Median gross rent	$777 ±$64	$972 ±$6	$1,413 ±$2
Median year built	1956 ±3	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 Cass County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Iowa	United States
Hispanic or Latino	357 ±0	2.7% ±<0.1	7.3% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	12,244 ±46	93.5% ±0.4	82.3% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	118 ±22	0.9% ±0.2	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	68 ±22	0.5% ±0.2	2.5% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 52	0% to 0.4%	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 115	0% to 0.9%	0.2% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 74	0% to 0.6%	0.3% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	203 ±81	1.6% ±0.6	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 Cass County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Iowa	United States
Born in the state	9,652 ±409	73.7% ±3.1	69.6% ±0.2	57.3% ±<0.1
Born in another state	3,294 ±402	25.2% ±3.1	23.8% ±0.2	26.9% ±<0.1
Born a citizen outside the states	12 to 48	0.1% to 0.4%	0.7% ±<0.1	1.7% ±<0.1
Born abroad	120 ±51	0.9% ±0.4	5.9% ±0.1	14.1% ±<0.1
Naturalized citizens	0 to 46	0% to 0.4%	2.6% ±0.1	7.4% ±<0.1
Not citizens	41 to 153	0.3% to 1.2%	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%.

Cass County among the counties of Iowa

58th of 99 by population, July 2025. Every one is listed on the Iowa page.

Counties of Iowa near Cass County in population, July 2025
County	July 2025	Change since 2020
Harrison County	14,623	+0.4%
Kossuth County	14,322	−3.2%
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%

Elsewhere on the site

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

Data retrieved September 25, 2026