• county
  • FIPS 18097
  • Largest town: Indianapolis

Marion County, Indiana

Marion County had 981,628 residents in the Census Vintage 2024 estimate, on 396.0 square miles of land. It is the most populous of Indiana's 92 county-equivalents.

Population
981,628
#1 of 92 in Indiana · #54 in US
Area
396.0 sq mi
#47 of 92 in Indiana · #2,544 in US
Density
2,479 / sq mi
#1 of 92 in Indiana · #52 in US
Median household income
$66,653
#47 of 92 in Indiana · #1,238 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Marion County within Indiana. Pin: Indianapolis.

Measure from here

Tools and pages that start from Marion County

Marion County population, land area and income

Marion County had 981,628 residents in the Census Vintage 2024 estimate, on 396.0 square miles of land. It is the most populous of Indiana's 92 county-equivalents. That works out to 2,478.9 people per square mile, 25.8 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Indiana has 34,874 residents, so Marion County is 28.1 times that size.

Its SAIPE 2023 median household income of $66,653 is above the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

981,628

3144th1st

54th of 3,144 (US)

Land area

396 sq mi

3144th1st

2544th of 3,144 (US)

Density

2,478.9 / sq mi

3144th1st

52nd of 3,144 (US)

Median household income

$66,653

3143rd1st

1238th of 3,143 (US)

Rank within Indiana (92)

Population

981,628

92nd1st

1st of 92 (IN)

Land area

396 sq mi

92nd1st

47th of 92 (IN)

Density

2,478.9 / sq mi

92nd1st

1st of 92 (IN)

Median household income

$66,653

92nd1st

47th of 92 (IN)

How Marion County's population changed since 2020

Marion County gained 4,922 residents between the July 2020 and July 2024 estimates, a rise of 0.5%. That ranks 54th of 92 in Indiana for growth. The median Indiana county changed by +0.8%, and the state as a whole by +2.0%.

Since the April 2020 estimates base, Marion County recorded 59,641 births and 40,492 deaths, a natural change of +19,149. Net international migration added +29,768 and net domestic migration, people moving to or from other US counties, came to -44,678. The largest single component was domestic migration, which removed 44,678 people.

976.7k2020971.7k2021973.4k2022975.7k2023981.6k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
59,641
Deaths
40,492
Net international migration
+29,768
Net domestic migration
-44,678
Change, July 2023 to July 2024
+5,974

Where Marion County is

The Census internal point of Marion County is at 39.783000, -86.135800. It sits in UTM zone 16N. The map shades Indiana's 92 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Marion County outlined. Dots are towns of 1,000+ people with residents in it.

Vigo County: +0.0%Fayette County: -0.1%Grant County: -0.1%Noble County: +0.7%Clay County: -0.0%Fulton County: -2.3%Henry County: +0.3%Jasper County: +1.5%Carroll County: +2.0%Huntington County: +0.8%Howard County: +0.6%Tipton County: -0.4%Starke County: +0.3%Lawrence County: +0.4%Jennings County: +0.2%Jay County: -1.5%Greene County: +1.3%Blackford County: -2.4%Madison County: +3.1%Parke County: +2.1%DeKalb County: +2.4%Scott County: +1.5%Benton County: +1.7%Wells County: +2.3%Wabash County: -0.5%Union County: -2.8%Marshall County: +0.8%Putnam County: +3.1%Clinton County: -0.8%Hamilton County: +8.8%Hancock County: +10.8%Jackson County: +2.0%Hendricks County: +8.5%Johnson County: +5.1%Decatur County: -0.2%Lake County: +0.8%Newton County: +2.5%Fountain County: +2.1%Crawford County: +0.0%Perry County: +0.9%Martin County: +0.6%Dearborn County: +1.3%Morgan County: +2.8%Monroe County: +0.0%Switzerland County: +2.5%Ohio County: +1.2%Sullivan County: -0.2%Franklin County: +1.5%Adams County: +2.0%Jefferson County: -0.5%Knox County: -1.1%Ripley County: +0.8%Vanderburgh County: +0.0%Gibson County: -0.1%LaGrange County: +1.5%Dubois County: -0.0%Harrison County: +0.8%Randolph County: -0.3%Brown County: +1.1%Shelby County: +1.3%Tippecanoe County: +2.8%Daviess County: +2.2%Delaware County: +1.1%Elkhart County: +0.2%Whitley County: +1.6%Allen County: +3.4%Montgomery County: +1.8%Miami County: -0.8%St. Joseph County: +0.4%Kosciusko County: +0.6%Floyd County: +1.8%Rush County: -0.1%Wayne County: -0.2%Posey County: -0.5%Clark County: +5.0%Orange County: -0.1%Marion County: +0.5%Boone County: +10.7%Porter County: +1.5%Steuben County: +1.2%Vermillion County: +0.8%Cass County: -0.6%Owen County: +2.5%White County: +0.6%Washington County: +0.4%Pulaski County: -0.8%Pike County: -1.1%Warren County: +0.3%Warrick County: +3.7%Spencer County: +1.8%LaPorte County: -0.8%Bartholomew County: +3.1%
Change 2020 to 2024
  1. < -0.2%
  2. < +0.4%
  3. < +1.2%
  4. < +2.1%
  5. ≥ +2.1%
no data

Orange pin: Marion County internal point. Dark pin: Indianapolis.

Internal point

Decimal
39.783000, -86.135800
DMS
39°46'58.80"N 86°08'8.88"W
UTM
16N 574001.3E 4404029.9N
Geohash
dp4drfmbf
Plus code
86FMQVM7+6M

Towns in Marion County

9 incorporated places of 1,000+ people have residents in Marion County, 979,376 people together, or 100% of the county. Each figure counts only the part of the town inside Marion County; towns marked "part" extend into another county. The largest is Indianapolis with 891,484.

  1. 01Indianapolis891,484
  2. 02Lawrence49,817
  3. 03Beech Grove14,566
  4. 04Speedway14,268
  5. 05Cumberland (part)2,504
  6. 06Southport2,081
  7. 07Meridian Hills1,779
  8. 08Warren Park1,492
  9. 09Clermont1,385
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Marion County

The Census 2024 county adjacency file lists 7 neighbors for Marion County. The most populous is Hamilton County, IN, with 379,704 residents. Distances run between Census internal points in a straight line.

Distance to Indianapolis and the nearest big city

Indianapolis is 1.5 miles SW of Marion County's internal point in a straight line. The nearest place of 100,000 or more is Indianapolis, IN (population 891,484), 0.7 miles away.

Marion County FIPS code

The FIPS code of Marion County is 18097: state code 18 for Indiana plus county code 097. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $66,653.

Questions people ask

What is the population of Marion County, Indiana?

The Census Vintage 2024 estimate for July 1, 2024 is 981,628. That is up 4,922 people (0.5%) from the July 2020 estimate of 976,706.

What is the FIPS code of Marion County?

18097. The first two digits (18) are Indiana; the last three (097) identify the county.

What is the largest town in Marion County?

Indianapolis, with 891,484 residents inside Marion County in 2024.

Which counties border Marion County?

7 county-equivalents border it in the Census 2024 adjacency file: Hamilton County, IN; Hendricks County, IN; Johnson County, IN; Hancock County, IN; Boone County, IN; Morgan County, IN; Shelby County, IN.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.