City · Iowa
Marengo, Iowa
Marengo, city, in Iowa County, Iowa. Marengo had 2,425 residents on July 1, 2025 by the Census Bureau's estimate, down 0.5% since 2020; the 2020 Census counted 2,435 and the ACS 2020-2024 5-year estimates put it at 2,725 (±365). GEOID 1949395.
Residents, July 2025 estimate
2,425
Census Bureau estimate (no margin published)
2020 Census count: 2,435 · ACS 2020-2024: 2,725 ±365
Median household income
$57,941
±$8,359 (90% margin)
Iowa: $75,059
Median home value
$123,200
±$14,111 (90% margin)
Iowa: $208,000
Median gross rent
$700
±$99 (90% margin)
Iowa: $972
Where is Marengo and what county is it in?
Marengo is a city in Iowa County, Iowa. It covers 2.1 square miles of land, 1,151 residents per square mile in 2020.
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Marengo, and is it growing?
The Census Bureau estimates that 2,425 people lived in Marengo on July 1, 2025, down 0.5% since 2020, while Iowa grew 1.5%. The 2020 Census counted 2,435 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 2,725 (±365).
| Measure | Marengo | Iowa County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 2,725 ±365 | 16,507 | no clear change |
| Households | 1,148 ±118 | 6,909 | no clear change |
| Average household size | 2.30 ±0.24 | 2.34 | no clear change |
| Housing units | 1,240 ±115 | 7,369 | no clear change |
Marengo's population since 2000
From 2,535 in 2000 to 2,425 in 2025: down 4.3%. The 2000, 2010 and 2020 figures are census counts, each for Marengo as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. 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); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Marengo?
The median resident of Marengo is 39.6 years old; 23.0% are under 18 and 21.2% are 65 or older. The largest group is non-Hispanic white residents at 94.9%, then non-Hispanic residents of two or more races at 2.9%.
| Measure | Marengo | Iowa County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 39.6 ±4.3 | 42.4 | no clear change |
| Under 18 years | 23.0% ±4.9 pts | 23.3% | – |
| 65 years and over | 21.2% ±3.6 pts | 20.3% | – |
| Male | 49.0% ±3.4 pts | 51.4% | – |
| Hispanic or Latino (any race) | 0.3% ±0.6 pts | 3.4% | – |
| White alone, not Hispanic | 94.9% ±2.3 pts | 92.5% | no clear change |
| Black or African American alone, not Hispanic | 1.1% ±1.2 pts | 0.3% | – |
| Asian alone, not Hispanic | 0.0% ±0.9 pts | 0.2% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.4% ±0.5 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.9 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.9% ±1.8 pts | 2.7% | – |
| Some other race alone, not Hispanic | 0.4% ±0.6 pts | 0.8% | – |
| Born outside the United States | 1.2% ±0.9 pts | 1.0% | – |
| Speak a language other than English at home (age 5+) | 1.1% ±1.0 pts | 2.7% | – |
| Civilian veterans (age 18+) | 6.8% ±2.8 pts | 8.6% | – |
| With a disability | 18.1% ±4.7 pts | 13.7% | – |
| No health insurance coverage | 4.7% ±2.8 pts | 3.2% | no clear change |
| High school graduate or higher (age 25+) | 91.4% ±3.2 pts | 95.5% | – |
| Bachelor's degree or higher (age 25+) | 12.9% ±4.1 pts | 24.8% | no clear change |
| Graduate or professional degree (age 25+) | 2.7% ±1.6 pts | 6.9% | – |
| Lived in the same house a year earlier | 89.7% ±3.8 pts | 91.6% | – |
| Moved from another state in the past year | 0.1% ±0.3 pts | 0.9% | – |
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 Marengo earn?
Half of Marengo's 1,148 households earn less than $57,941 a year (±$8,359), against $71,223 in Iowa County and $75,059 in Iowa. In 2015-2019 it was $66,679 in 2024 dollars; the margins of error cannot tell the two periods apart. 13.2% of residents live below the poverty line.
| Measure | Marengo | Iowa County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $57,941 ±$8,359 | $71,223 | no clear change |
| Mean household income | $66,477 ±$6,590 | $90,784 | – |
| Per capita income | $29,735 ±$3,436 | $38,618 | no clear change |
| People below the poverty line | 13.2% ±5.5 pts | 8.9% | no clear change |
| Children under 18 below the poverty line | 17.7% ±11.1 pts | 12.7% | no clear change |
| Households receiving SNAP | 14.7% ±5.5 pts | 6.5% | – |
| Households with a computer | 89.5% ±4.9 pts | 94.4% | – |
| Households with a broadband subscription | 78.5% ±6.7 pts | 88.5% | – |
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 Marengo?
Owners occupy 69.2% of Marengo's occupied homes and renters 30.8%. The median owner-occupied home is valued at $123,200 by its owner (±$14,111). The median renter pays $700 a month including utilities, and 27.9% of renters pay 35% or more of their income on rent.
| Measure | Marengo | Iowa County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $123,200 ±$14,111 | $193,900 | no clear change |
| Median gross rent | $700 ±$99 | $686 | no clear change |
| Renters paying 35% or more of income on rent | 27.9% ±14.4 pts | 23.4% | no clear change |
| Median monthly owner costs, with a mortgage | $1,287 ±$95 | $1,507 | – |
| Owner-occupied homes | 69.2% ±6.8 pts | 76.6% | no clear change |
| Renter-occupied homes | 30.8% ±6.8 pts | 23.4% | – |
| Housing units | 1,240 ±115 | 7,369 | no clear change |
| Homeowner vacancy rate | 0.0% ±3.0 pts | 0.2% | – |
| Rental vacancy rate | 3.6% ±5.0 pts | 3.4% | – |
| Single-family detached homes | 74.9% ±6.9 pts | 79.3% | – |
| Mobile homes | 7.7% ±3.9 pts | 3.1% | – |
| Built 2020 or later | 0.0% ±2.0 pts | 0.2% | – |
| Built 2010 to 2019 | 3.4% ±3.4 pts | 6.9% | – |
| Built 1939 or earlier | 38.0% ±7.0 pts | 34.2% | – |
| Households with no vehicle | 12.2% ±6.0 pts | 3.5% | – |
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 Marengo building?
Builders took permits for 1 new housing units in Marengo in 2025 (1 in single-family houses), 0.4 per 1,000 residents against 4.2 across Iowa.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Marengo work and get to work?
81.1% of Marengo's workers drive alone and 5.7% work from home. The average trip to work takes 20.2 minutes.
| Measure | Marengo | Iowa County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 66.3% ±5.2 pts | 66.7% | – |
| Unemployment rate | 1.8% ±1.6 pts | 1.9% | – |
| Drove alone to work | 81.1% ±6.3 pts | 83.0% | – |
| Carpooled | 9.0% ±5.1 pts | 5.8% | – |
| Public transportation | 0.0% ±1.8 pts | 0.1% | – |
| Walked | 3.5% ±2.2 pts | 2.6% | – |
| Worked from home | 5.7% ±3.1 pts | 8.1% | – |
| Mean travel time to work | 20.2 min ±3.6 | 22.2 min | no clear change |
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 census tracts are in Marengo?
No census tract lies mostly in Marengo; 1 tract reaches into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 9602Iowa County | 4,243 | $61,280 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Marengo) · Census block assignment files
How does Marengo compare with other places in Iowa?
By the Census Bureau's July 2025 estimates, Marengo is the 7,002nd-most populous of the 19,476 U.S. incorporated places that have one and the 141st-most populous of 939 in Iowa.
Marengo ranks 232nd of 279 places in Iowa with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 141st | 939 |
| Growth 2020-2025 (PEP) | 134th | 275 |
| Residents per square mile | 113th | 279 |
| Median household income | 232nd | 279 |
| Per capita income | 249th | 279 |
| Median home value | 223rd | 279 |
| Median gross rent | 233rd | 266 |
| Poverty rate | 74th | 232 |
| Bachelor's degree or higher | 271st | 279 |
| Median age | 141st | 279 |
| Owner-occupied share | 187th | 279 |
| Work from home | 180th | 221 |
| Travel time to work | 138th | 279 |
Marengo's figures with every place in Iowa (CSV)
Every place in Iowa, sortable · Compare Marengo with other places
Source: PlainCities ranks computed 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 reliable are the figures for Marengo?
15 of the 57 figures for Marengo on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
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 Marengo 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' public schools in Marengo.