Marion County, Indiana Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 1st-largest in Indiana
The population of Marion County, Indiana is 971,822 as of the 2023 American Community Survey, making it the 1st-largest county in Indiana. The median household income is $63,450, the median home value is $207,000, and the median age is 34.3.
The population of Marion County has grown 8.5% since 2010 (904,604 → 981,628), a +0.59% annualized rate.
971,822
Population
+0.59%
Annual growth
2454
People / sq mi
$63,450
Median Income
$207,000
Median Home Value
Marion County covers 396 sq mi of land at 2454.1 people per square mile.
About Marion County, IN
What distinguishes Marion County is density: among the most densely settled of US counties, around 2,454 people per square mile. With 971,822 residents, Marion County is a county in Indiana. It is the #1-largest of all counties in Indiana nationally.
The typical household here earns about $63,450, below the US median of $78,538. The poverty rate is 11.1%, below the national 12.4%. Homes carry a median value of $207,000, with typical rent around $1,107.
College attainment is above the local norm at 34.1%, near the national 35.0%. About 12.3% of workers primarily work from home, below the national 14.0%, and the average commute runs about 24 minutes each way.
That density explains much of the rest of the profile in Marion County: denser places lean toward renting, shorter commutes by transit, and a younger working-age mix.
Marion County Population History (2010-2024)
The county of Marion County had a population of 904,604 in 2010 and 981,628 in 2024, a 8.5% growth over 14 years. The peak was 981,628 in 2024. Average annual growth rate: 0.59%.
981,628
Population (2024)
904,604
Population (2010)
981,628
Peak (2024)
0.59%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 904,604 |
| 2011 | 911,294 |
| 2012 | 919,917 |
| 2013 | 930,127 |
| 2014 | 936,178 |
| 2015 | 940,152 |
| 2016 | 946,050 |
| 2017 | 951,247 |
| 2018 | 959,370 |
| 2019 | 963,829 |
| 2020 | 976,706 |
| 2021 | 971,682 |
| 2022 | 973,375 |
| 2023 | 975,654 |
| 2024 | 981,628 |
Race & Ethnicity
| White | 54.2% |
| Black or African American | 27.6% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.6% |
| Two or More Races | 0.0% |
Age & Sex
34.3
Median Age
51.6%
Female
48.4%
Male
12.9%
Age 65+
Age Distribution
Children (under 15): 21.0% · Seniors (65+): 12.9%
Income & Poverty
| Median household income | $63,450$-6,601 vs state |
| Mean household income | $87,280 |
| Per-capita income | $36,355 |
| Poverty rate | 11.1%+2.7% vs state |
| Unemployment rate | 3.5% |
| Employment-to-population | 64.7% |
Top Industries by Employment
The largest employment sector in Marion County is professional & business services, accounting for 22.3% of workers.
How residents commute
1.3%
Drive alone
1.7%
Carpool
73.8%
Public transit
12.3%
Work from home
24.2 min
Avg commute
Housing
$207,000+$5,400 vs state
Median home value
$1,107
Median rent
55.9%
Homeownership rate
439,034
Total housing units
90.3%
Occupied
9.7%
Vacant
44.1%
Renter-occupied
Social & access
91.0%
With health insurance
93.9%
With broadband internet
23.4%
Foreign-born
5.6%
Veterans (18+)
13.4%
With a disability
83.2%
Speak language other than English at home
Education
87.7%
High School+
34.1%
Bachelor's+
Largest cities in Indiana
Other counties in Indiana
Part of Indiana
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County rankings
Common questions about Marion County, IN
Frequently Asked Questions
Marion County, Indiana has a population of 971,822 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 1st-largest county in Indiana. Population density is 2454 people per square mile.
The population of Marion County has grown 8.5% since 2010 (904,604 → 981,628), a +0.59% annualized rate.
The median household income in Marion County, Indiana is $63,450, with mean (average) household income of $87,280 and per-capita income of $36,355. 11.1% of residents live below the federal poverty level.
In Marion County, the largest racial and ethnic groups are White (54.2%), Black or African American (27.6%), Hispanic or Latino (1.6%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Marion County, Indiana is 34.3 years. Residents are 51.6% female and 48.4% male.
The median home value in Marion County is $207,000 and median monthly rent is $1,107. 55.9% of occupied housing units are owner-occupied. The county has 439,034 total housing units, 9.7% of which are vacant.
The largest employment sector in Marion County, Indiana is professional, scientific, and management services, employing 22.3% of workers. The unemployment rate is 3.5%.
Indianapolis is among the largest cities associated with Marion County, Indiana, with a population of 882,043.
Marion County, IN Climate
Marion County, IN has an average annual temperature of 11.5°C (53°F) and receives about 1016 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
11.5°C
Avg Temp
1016
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -3° / 26° | 57 mm |
| February | -1° / 31° | 58 mm |
| March | 5° / 41° | 84 mm |
| April | 11° / 52° | 97 mm |
| May | 17° / 63° | 108 mm |
| June | 22° / 72° | 95 mm |
| July | 25° / 76° | 114 mm |
| August | 23° / 74° | 94 mm |
| September | 20° / 67° | 73 mm |
| October | 13° / 55° | 71 mm |
| November | 6° / 43° | 89 mm |
| December | 0° / 32° | 76 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 County, IN
The most comfortable months to visit Marion County, IN are typically September, June and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 30°C high). The coldest is January (near -8°C low). July is usually the wettest month.
Where to stay near Marion County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.