Dallas County, Iowa Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 7th-largest in Iowa
The population of Dallas County, Iowa is 104,136 as of the 2023 American Community Survey, making it the 7th-largest county in Iowa. The median household income is $102,349, the median home value is $333,400, and the median age is 35.8.
The population of Dallas County has grown 72.8% since 2010 (66,751 → 115,343), a +3.98% annualized rate.
104,136
Population
+3.98%
Annual growth
177
People / sq mi
$102,349
Median Income
$333,400
Median Home Value
Dallas County covers 588 sq mi of land at 177.0 people per square mile.
About Dallas County, IA
Dallas County is defined demographically by education — 51.6% of adults hold a bachelor’s degree, above the national average. Dallas County is a county in Iowa with a population of 104,136. That makes it one of the ten largest counties in Iowa in the country, at #7 by population.
Earnings sit at the high end: a median household income of $102,349, above the US median of $78,538. Poverty is among the lowest of comparable US counties, at 4.4% — below the national 12.4%. The median home value is $333,400, with typical rent around $1,239.
The population is unusually well-credentialed for US counties — 51.6% of adults have a four-year degree, above the national 35.0%. Remote work is widespread — 18.6% of workers stay home, above the national 14.0%, and the average commute runs about 21 minutes each way.
The education numbers are the throughline: a college-heavy population in Dallas County usually coincides with higher incomes and a workforce concentrated in professional and information industries.
Dallas County Population History (2010-2024)
The county of Dallas County had a population of 66,751 in 2010 and 115,343 in 2024, a 72.8% growth over 14 years. The peak was 115,343 in 2024. Average annual growth rate: 3.99%.
115,343
Population (2024)
66,751
Population (2010)
115,343
Peak (2024)
3.99%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 66,751 |
| 2011 | 69,699 |
| 2012 | 72,248 |
| 2013 | 74,968 |
| 2014 | 77,758 |
| 2015 | 80,658 |
| 2016 | 84,278 |
| 2017 | 87,219 |
| 2018 | 89,999 |
| 2019 | 93,631 |
| 2020 | 100,544 |
| 2021 | 104,194 |
| 2022 | 108,164 |
| 2023 | 111,593 |
| 2024 | 115,343 |
Race & Ethnicity
| White | 84.9% |
| Black or African American | 2.5% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.8% |
| Two or More Races | 0.0% |
Age & Sex
35.8
Median Age
50.3%
Female
49.7%
Male
12.5%
Age 65+
Age Distribution
Children (under 15): 22.5% · Seniors (65+): 12.5%
Income & Poverty
| Median household income | $102,349+$29,202 vs state |
| Mean household income | $134,691 |
| Per-capita income | $52,722 |
| Poverty rate | 4.4%-2.5% vs state |
| Unemployment rate | 2.2% |
| Employment-to-population | 72.9% |
Top Industries by Employment
The largest employment sector in Dallas County is professional & business services, accounting for 22.7% of workers.
How residents commute
0.1%
Drive alone
1.2%
Carpool
71.9%
Public transit
18.6%
Work from home
20.8 min
Avg commute
Housing
$333,400+$137,500 vs state
Median home value
$1,239
Median rent
69.5%
Homeownership rate
43,195
Total housing units
94.6%
Occupied
5.4%
Vacant
30.5%
Renter-occupied
Social & access
95.9%
With health insurance
96.8%
With broadband internet
21.5%
Foreign-born
5.8%
Veterans (18+)
7.7%
With a disability
87.4%
Speak language other than English at home
Education
96.1%
High School+
51.6%
Bachelor's+
Largest cities in Iowa
Other counties in Iowa
Part of Iowa
Metro areas in Iowa
County rankings
Frequently Asked Questions
Dallas County, Iowa has a population of 104,136 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 7th-largest county in Iowa. Population density is 177 people per square mile.
The population of Dallas County has grown 72.8% since 2010 (66,751 → 115,343), a +3.98% annualized rate.
The median household income in Dallas County, Iowa is $102,349, with mean (average) household income of $134,691 and per-capita income of $52,722. 4.4% of residents live below the federal poverty level.
In Dallas County, the largest racial and ethnic groups are White (84.9%), Black or African American (2.5%), Hispanic or Latino (0.8%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Dallas County, Iowa is 35.8 years. Residents are 50.3% female and 49.7% male.
The median home value in Dallas County is $333,400 and median monthly rent is $1,239. 69.5% of occupied housing units are owner-occupied. The county has 43,195 total housing units, 5.4% of which are vacant.
The largest employment sector in Dallas County, Iowa is professional, scientific, and management services, employing 22.7% of workers. The unemployment rate is 2.2%.
Des Moines is among the largest cities associated with Dallas County, Iowa, with a population of 212,464.
Dallas County, IA Climate
Dallas County, IA has an average annual temperature of 9.4°C (49°F) and receives about 838 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
9.4°C
Avg Temp
838
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -7° / 19° | 21 mm |
| February | -4° / 25° | 24 mm |
| March | 3° / 37° | 54 mm |
| April | 10° / 50° | 82 mm |
| May | 16° / 61° | 107 mm |
| June | 22° / 71° | 123 mm |
| July | 24° / 74° | 97 mm |
| August | 22° / 72° | 102 mm |
| September | 18° / 64° | 91 mm |
| October | 11° / 52° | 65 mm |
| November | 3° / 37° | 43 mm |
| December | -4° / 24° | 29 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 Dallas County, IA
The most comfortable months to visit Dallas County, IA are typically August, June and July, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 30°C high). The coldest is January (near -13°C low). June is usually the wettest month.
Where to stay near Dallas County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.