Marion, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Marion, Illinois is 16,796 as of the 2023 American Community Survey, making it the 150th-largest city in Illinois. The median household income is $57,281, the median home value is $145,300, and the median age is 40.4.
The population has declined 1.3% since 2010 (17,248 → 17,021).
16,796
Population
1166
People / sq mi
$57,281
Median Income
$145,300
Median Home Value
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Marion covers 14.4 sq mi of land at 1166 people per square mile.
About Marion, IL
Housing cost is the defining feature of Marion: the median home is valued at $145,300. With 16,796 residents, Marion is a city in Illinois.
The typical household earns $57,281, below the US median of $78,538. Poverty sits at 11.0%, below the national 12.4%. Housing is relatively affordable, with a median home value of $145,300, with typical rent around $878.
27.4% of adults 25 and older hold a bachelor’s degree, below the national average of 35.0%. Around 13.9% of workers work from home, close to the national 14.0%, and the average commute runs about 22 minutes each way.
Marion city Population History (2010-2024)
The city of Marion city had a population of 17,248 in 2010 and 17,021 in 2024, a -1.3% growth over 14 years. The peak was 17,757 in 2013. Average annual growth rate: -0.09%.
17,021
Population (2024)
17,248
Population (2010)
17,757
Peak (2013)
-0.09%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 17,248 |
| 2011 | 17,345 |
| 2012 | 17,359 |
| 2013 | 17,757 |
| 2014 | 17,747 |
| 2015 | 17,613 |
| 2016 | 17,657 |
| 2017 | 17,588 |
| 2018 | 17,602 |
| 2019 | 17,520 |
| 2020 | 16,831 |
| 2021 | 16,736 |
| 2022 | 16,696 |
| 2023 | 16,858 |
| 2024 | 17,021 |
Race & Ethnicity
| White | 86.2% |
| Black or African American | 5.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.4% |
| Two or More Races | 0.0% |
Economy & Income
$57,281
Median Household Income
$37,202
Per Capita Income
11.0%
Poverty Rate
2.3%
Unemployment Rate
Housing
$145,300
Median Home Value
$878
Median Rent
62.2%
Owner-Occupied
Education
93.8%
High School+
27.4%
Bachelor's+
Commute
0.1%
Drive Alone
77.2%
Public Transit
13.9%
Work From Home
21.9 min
Avg Commute
Community Profile
19.9%
Foreign Born
95.9%
Non-English at Home
10.8%
Veterans
22.9%
With Disability
92.8%
Health Insurance
89.3%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 27.9% |
| Education, Health Care & Social Services | 10.4% |
| Information | 8.4% |
| Manufacturing | 8.0% |
| Finance, Insurance & Real Estate | 7.1% |
| Arts, Entertainment & Food Services | 6.0% |
| Construction | 4.5% |
| Agriculture & Mining | 4.5% |
| Retail Trade | 4.2% |
| Public Administration | 3.2% |
| Transportation & Warehousing | 2.1% |
Largest cities in Illinois
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City rankings
Frequently Asked Questions
Marion, Illinois has a population of 16,796 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 150th-largest city in Illinois.
The median household income in Marion, Illinois is $57,281, with 11.0% of residents living below the federal poverty level.
The median home value in Marion, Illinois is $145,300, with median monthly rent at $878 and a homeownership rate of 62.2%.
The median age in Marion, Illinois is 40.4 years. The population is 47.8% male and 52.2% female.
The population has declined 1.3% since 2010 (17,248 → 17,021).
Marion city, IL Climate
Marion city, IL has an average annual temperature of 13.4°C (56°F) and receives about 1152 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
13.4°C
Avg Temp
1152
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 0° / 31° | 74 mm |
| February | 2° / 36° | 79 mm |
| March | 8° / 46° | 121 mm |
| April | 14° / 56° | 110 mm |
| May | 19° / 65° | 121 mm |
| June | 23° / 74° | 102 mm |
| July | 26° / 78° | 94 mm |
| August | 25° / 76° | 90 mm |
| September | 21° / 70° | 79 mm |
| October | 14° / 58° | 75 mm |
| November | 8° / 47° | 106 mm |
| December | 2° / 36° | 101 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 Marion city, IL
The most comfortable months to visit Marion city, IL are typically September, June and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 32°C high). The coldest is January (near -5°C low). March is usually the wettest month.
Where to stay near Marion
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.