Spencer, Iowa Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Spencer, Iowa is 11,393 as of the 2023 American Community Survey, making it the 35th-largest city in Iowa. The median household income is $57,068, the median home value is $178,300, and the median age is 41.3.
The population has grown 1.7% since 2010 (11,225 → 11,418).
11,393
Population
1041
People / sq mi
$57,068
Median Income
$178,300
Median Home Value
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Spencer covers 10.9 sq mi of land at 1041 people per square mile.
About Spencer, IA
Remote work is unusually rare in Spencer: 5.6% of workers primarily work from home, below the 14.0% national rate. Spencer is a city in Iowa with a population of 11,393. It ranks #35 among cities in Iowa by population.
The typical household earns $57,068, below the US median of $78,538. The poverty rate is 8.0%, below the national 12.4%. Property is affordable here, the median home worth $178,300, with typical rent around $795.
Degree attainment is mid-range for US cities: 28.2% of adults hold a four-year degree, below the national 35.0%. Remote work is on the lower side here, at 5.6%, below the national 14.0%, and the average commute runs about 17 minutes each way.
Spencer city Population History (2010-2024)
The city of Spencer city had a population of 11,225 in 2010 and 11,418 in 2024, a 1.7% growth over 14 years. The peak was 11,464 in 2023. Average annual growth rate: 0.13%.
11,418
Population (2024)
11,225
Population (2010)
11,464
Peak (2023)
0.13%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 11,225 |
| 2011 | 11,203 |
| 2012 | 11,164 |
| 2013 | 11,130 |
| 2014 | 11,180 |
| 2015 | 11,199 |
| 2016 | 11,094 |
| 2017 | 11,032 |
| 2018 | 11,011 |
| 2019 | 10,952 |
| 2020 | 11,304 |
| 2021 | 11,401 |
| 2022 | 11,440 |
| 2023 | 11,464 |
| 2024 | 11,418 |
Race & Ethnicity
| White | 93.7% |
| Black or African American | 0.7% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.7% |
| Two or More Races | 0.0% |
Economy & Income
$57,068
Median Household Income
$36,456
Per Capita Income
8.0%
Poverty Rate
3.3%
Unemployment Rate
Housing
$178,300
Median Home Value
$795
Median Rent
67.7%
Owner-Occupied
Education
95.2%
High School+
28.2%
Bachelor's+
Commute
1.6%
Drive Alone
79.3%
Public Transit
5.6%
Work From Home
17.4 min
Avg Commute
Community Profile
25.4%
Foreign Born
97.5%
Non-English at Home
8.0%
Veterans
15.5%
With Disability
94.8%
Health Insurance
95.8%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 28.7% |
| Manufacturing | 10.8% |
| Education, Health Care & Social Services | 9.9% |
| Finance, Insurance & Real Estate | 9.8% |
| Construction | 5.6% |
| Retail Trade | 4.9% |
| Information | 4.5% |
| Public Administration | 2.6% |
| Agriculture & Mining | 2.6% |
| Arts, Entertainment & Food Services | 2.5% |
| Transportation & Warehousing | 0.4% |
Largest cities in Iowa
Largest counties in Iowa
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Metro areas in Iowa
City rankings
Frequently Asked Questions
Spencer, Iowa has a population of 11,393 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 35th-largest city in Iowa.
The median household income in Spencer, Iowa is $57,068, with 8.0% of residents living below the federal poverty level.
The median home value in Spencer, Iowa is $178,300, with median monthly rent at $795 and a homeownership rate of 67.7%.
The median age in Spencer, Iowa is 41.3 years. The population is 47.6% male and 52.4% female.
The population has grown 1.7% since 2010 (11,225 → 11,418).
Spencer city, IA Climate
Spencer city, IA has an average annual temperature of 7.7°C (46°F) and receives about 732 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
7.7°C
Avg Temp
732
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -10° / 15° | 13 mm |
| February | -6° / 21° | 18 mm |
| March | 1° / 33° | 48 mm |
| April | 8° / 47° | 70 mm |
| May | 15° / 60° | 90 mm |
| June | 21° / 69° | 103 mm |
| July | 23° / 73° | 102 mm |
| August | 21° / 70° | 100 mm |
| September | 17° / 62° | 85 mm |
| October | 10° / 49° | 53 mm |
| November | 0° / 33° | 30 mm |
| December | -7° / 19° | 20 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 Spencer city, IA
The most comfortable months to visit Spencer city, IA are typically August, June and July, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 29°C high). The coldest is January (near -15°C low). June is usually the wettest month.
Where to stay near Spencer
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.