County · Iowa
Cass County, Iowa
Cass County, Iowa. Cass County had 12,960 residents in 2025 by the Census Bureau's estimate, down 1.3% since 2020, while Iowa grew 1.5%. It holds 8 places (8 cities, villages and boroughs) and 5 census tracts. GEOID 19029.
Residents, July 2025 estimate
12,960
Census Bureau estimate (no margin published)
2020 Census count: 13,127 · ACS 2020-2024: 13,096
Median household income
$63,013
±$3,821 (90% margin)
Iowa: $75,059
Median home value
$150,300
±$10,147 (90% margin)
Iowa: $208,000
Median gross rent
$777
±$64 (90% margin)
Iowa: $972
How many people live in Cass County, and is it growing?
The 2020 Census counted 13,127 residents in Cass County. The Census Bureau estimates 12,960 for July 1, 2025, down 1.3% since 2020, while Iowa grew 1.5%. The 2020-2024 American Community Survey puts the population at 13,096 over 564 square miles of land.
| Measure | Cass County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Total population | 13,096 | 3,210,507 | +5 |
| Households | 5,844±131 | 1,315,707 | no clear change |
| Average household size | 2.20±0.05 | 2.36 | no clear change |
| Housing units | 6,393±24 | 1,437,699 | −184 |
Cass County's population since 2000
From 14,684 in 2000 to 12,960 in 2025: down 11.7%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Cass County?
Cass County holds 8 places: 8 cities, villages and boroughs (incorporated places). The largest is Atlantic with 6,676 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Atlantic | 6,792 | $61,141 |
|---|---|---|
| Griswold | 994 | $55,000 |
| Anita | 963 | $66,307 |
| Massena | 359 | $61,827 |
| LewisGEOID 1944805 | 357 | $36,691 |
| Cumberland | 251 | $47,083 |
| MarneGEOID 1949575 | 110 | $61,875 |
| WiotaGEOID 1986610 | 91 | $78,077 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Cass County?
The median resident of Cass County is 43.5 years old; 23.2% are under 18 and 23.4% are 65 or older. The largest group is non-Hispanic white residents at 93.5%, then Hispanic or Latino residents (of any race) at 2.7%. 0.9% of residents were born outside the United States.
| Measure | Cass County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Median age | 43.5±0.6 | 38.6 | −1.4 |
| Under 18 years | 23.2%±0.8 pts | 22.9% | – |
| 65 years and over | 23.4%±0.1 pts | 18.1% | – |
| Hispanic or Latino (any race) | 2.7% | 7.3% | no clear change |
| White alone, not Hispanic | 93.5%±0.4 pts | 82.3% | −1.8 pts |
| Black or African American alone, not Hispanic | 0.9%±0.2 pts | 3.8% | – |
| Asian alone, not Hispanic | 0.5%±0.2 pts | 2.5% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.2%±0.2 pts | 0.2% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.4%±0.5 pts | 0.2% | – |
| Two or more races, not Hispanic | 1.6%±0.6 pts | 3.5% | – |
| Some other race alone, not Hispanic | 0.2%±0.3 pts | 0.3% | – |
| Born outside the United States | 0.9%±0.4 pts | 5.9% | no clear change |
| Speak a language other than English at home (age 5+) | 1.4%±0.5 pts | 9.1% | – |
| Civilian veterans (age 18+) | 6.4%±1.4 pts | 6.5% | – |
| With a disability | 15.0%±2.0 pts | 12.6% | – |
| No health insurance coverage | 4.1%±1.5 pts | 5.0% | no clear change |
| High school graduate or higher (age 25+) | 94.5%±1.7 pts | 93.3% | – |
| Bachelor's degree or higher (age 25+) | 22.1%±2.4 pts | 31.4% | no clear change |
| Graduate or professional degree (age 25+) | 5.1%±1.3 pts | 10.5% | – |
| Moved from another state in the past year | 1.4%±0.8 pts | 2.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Cass County earn?
Half of Cass County's 5,844 households earn less than $63,013 a year (±$3,821), against $75,059 in Iowa. In 2015-2019 it was $61,765 in 2024 dollars; the margins of error cannot tell the two periods apart. 14.3% of residents live below the poverty line.
| Measure | Cass County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $63,013±$3,821 | $75,059 | no clear change |
| Mean household income | $84,546±$6,636 | $98,187 | – |
| Per capita income | $37,667±$2,591 | $40,877 | no clear change |
| People below the poverty line | 14.3%±2.8 pts | 11.1% | no clear change |
| Children under 18 below the poverty line | 21.3%±6.6 pts | 12.9% | no clear change |
| Households receiving SNAP | 12.0%±2.5 pts | 8.8% | – |
| Households with a broadband subscription | 83.9%±2.5 pts | 88.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Cass County?
Owners occupy 71.6% of Cass County's occupied homes and renters 28.4%. The median owner-occupied home is valued at $150,300 by its owner (±$10,147). The median renter pays $777 a month including utilities, and 39.3% of renters pay 35% or more of their income on rent.
| Measure | Cass County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $150,300±$10,147 | $208,000 | +$24,646 |
| Median gross rent | $777±$64 | $972 | no clear change |
| Renters paying 35% or more of income on rent | 39.3%±7.6 pts | 35.2% | +14.5 pts |
| Median monthly owner costs, with a mortgage | $1,128±$82 | $1,533 | – |
| Owner-occupied homes | 71.6%±3.0 pts | 71.7% | no clear change |
| Housing units | 6,393±24 | 1,437,699 | −184 |
| Homeowner vacancy rate | 0.2%±0.2 pts | 0.8% | – |
| Rental vacancy rate | 6.2%±4.3 pts | 5.7% | – |
| Single-family detached homes | 81.7%±2.6 pts | 72.2% | – |
| Mobile homes | 2.3%±1.4 pts | 3.2% | – |
| Built 2020 or later | 0.9%±0.6 pts | 1.7% | – |
| Built 1939 or earlier | 38.1%±3.7 pts | 23.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Cass County building?
Builders took permits for 11 new housing units across Cass County in 2025 (7 single-family), 0.8 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Cass County get to work?
79.7% of Cass County's workers drive alone and 10.0% work from home. The average trip to work takes 15.1 minutes. The unemployment rate in 2020-2024 averaged 1.4%.
| Measure | Cass County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 63.5%±2.5 pts | 66.4% | – |
| Unemployment rate | 1.4%±0.7 pts | 3.6% | no clear change |
| Drove alone to work | 79.7%±3.3 pts | 76.0% | – |
| Carpooled | 4.9%±1.7 pts | 7.8% | – |
| Public transportation | 0.1%±0.1 pts | 0.7% | – |
| Walked | 3.8%±1.5 pts | 2.9% | – |
| Worked from home | 10.0%±2.8 pts | 11.3% | +6.1 pts |
| Mean travel time to work | 15.1 min±1.1 | 19.8 min | −3.2 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Cass County's census tracts?
Cass County is divided into 5 census tracts. Among those with a reliable estimate, median household income runs from $47,841 (Tract 1905) to $75,403 (Tract 1901).
| Tract 190119029190100 | 2,376±189 | $75,403 |
|---|---|---|
| Tract 190219029190200 | 2,195±197 | $62,721 |
| Tract 190319029190300 | 1,582±167 | $60,781 |
| Tract 190419029190400 | 4,235±298 | $64,703 |
| Tract 190519029190500 | 2,708±299 | $47,841 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Cass County compare with Iowa's other counties?
| Measure | Rank |
|---|---|
| Population | 58th of 99 |
| Growth 2020-2025 | 54th of 99 |
| Residents per square mile | 61st of 99 |
| Median household income | 84th of 99 |
| Median home value | 63rd of 99 |
| Median gross rent | 68th of 99 |
| Poverty rate | 15th of 99 |
| Bachelor's degree or higher | 53rd of 99 |
| Median age | 28th of 99 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Cass County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.