How many people live in ?

Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 981,600 people living in Marion County, IN. That makes Marion County the most populous county in Indiana. It is home to 14.1% of people living in the state.

982K

population of Marion County, IN (2024)

14.1%

County share of the Indiana population (2024)

About 981,600 people lived in Marion County, IN in 2024.

Population estimates, 2000–2024

What are Marion County, IN’s age demographics?

About 136,000 Marion County residents are aged 65 and older in 2024. That represents 13.9% of its population. For comparison, the age group represents 17.5% of Indiana’s population and 18% in the US overall.
Another 243,100 Marion County residents, or 24.8% of the population, were children under 18. For comparison, the age group represents 22.9% of Indiana’s population and 21.6% in the US overall.

A lower share of Marion County, IN's population is aged 65 or older than the US as a whole.

Population estimates by age group, (2024)

What are Marion County, IN’s racial and ethnic demographics?

Non-Hispanic Black or African American residents make up 29.3% of the Marion County, IN population, higher than the national share of 12.6%. Marion County, IN also has a larger share of people identifying as non-Hispanic two or more races (2.9%) than the US overall (2.5%).
In contrast, Marion County’s non-Hispanic white population accounts for 48.7%, below the 57.5% nationwide, and the Hispanic population makes up 14.4% of the county, compared with 20% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.

Marion County, IN has a higher share of a non-Hispanic Black or African American population than Indiana as a whole.

Population estimates by race and ethnicity, (2024)

The largest city or town in Marion County, IN is Indianapolis with about 150,400 residents in 2024.

Cities and towns in Marion County, IN ranked by population

Population (2024), includes only portions within county

Cities and towns in Marion County, IN ranked by population
City or townPopulation
1.

Indianapolis (pt.)

150,435
2.

Indianapolis (pt.)

135,832
3.

Indianapolis (pt.)

134,020
4.

Indianapolis (pt.)

109,753
5.

Indianapolis (pt.)

102,710
6.

Indianapolis (pt.)

83,267
7.

Indianapolis (pt.)

73,316
8.

Indianapolis (pt.)

64,921
9.

Lawrence 

49,817
10.

Indianapolis (pt.)

37,230

Keep exploring

Methodology

USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.

The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.

Page sources

USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.