• county
  • FIPS 18081
  • Largest town: Greenwood

Johnson County, Indiana

Johnson County had 170,614 residents in the Census Vintage 2024 estimate, on 320.4 square miles of land. It ranks 11th of 92 in Indiana by population and 75th by land area.

Population
170,614
#11 of 92 in Indiana · #409 in US
Area
320.4 sq mi
#75 of 92 in Indiana · #2,760 in US
Density
532 / sq mi
#8 of 92 in Indiana · #267 in US
Median household income
$91,676
#5 of 92 in Indiana · #222 in US

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

Johnson County within Indiana. Pin: Indianapolis.

Measure from here

Tools and pages that start from Johnson County

Johnson County population, land area and income

Johnson County had 170,614 residents in the Census Vintage 2024 estimate, on 320.4 square miles of land. It ranks 11th of 92 in Indiana by population and 75th by land area. That works out to 532.5 people per square mile, 5.5 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Indiana has 34,874 residents, so Johnson County is 4.9 times that size.

Its SAIPE 2023 median household income of $91,676 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

170,614

3144th1st

409th of 3,144 (US)

Land area

320 sq mi

3144th1st

2760th of 3,144 (US)

Density

532.5 / sq mi

3144th1st

267th of 3,144 (US)

Median household income

$91,676

3143rd1st

222nd of 3,143 (US)

Rank within Indiana (92)

Population

170,614

92nd1st

11th of 92 (IN)

Land area

320 sq mi

92nd1st

75th of 92 (IN)

Density

532.5 / sq mi

92nd1st

8th of 92 (IN)

Median household income

$91,676

92nd1st

5th of 92 (IN)

How Johnson County's population changed since 2020

Johnson County gained 8,351 residents between the July 2020 and July 2024 estimates, a rise of 5.1%. That ranks 5th 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, Johnson County recorded 8,119 births and 7,085 deaths, a natural change of +1,034. Net international migration added +1,441 and net domestic migration, people moving to or from other US counties, came to +6,433. The largest single component was domestic migration, which added 6,433 people.

162.3k2020164.4k2021166.0k2022168.3k2023170.6k2024
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
8,119
Deaths
7,085
Net international migration
+1,441
Net domestic migration
+6,433
Change, July 2023 to July 2024
+2,309

Where Johnson County is

The Census internal point of Johnson County is at 39.496100, -86.094300. 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 Johnson 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: Johnson County internal point. Dark pin: Indianapolis.

Internal point

Decimal
39.496100, -86.094300
DMS
39°29'45.96"N 86°05'39.48"W
UTM
16N 577876.2E 4372223.2N
Geohash
dp4b8yh13
Plus code
86FMFWW4+C7

Towns in Johnson County

8 incorporated places of 1,000+ people have residents in Johnson County, 123,849 people together, or 73% of the county. Each figure counts only the part of the town inside Johnson County; towns marked "part" extend into another county. The largest is Greenwood with 68,175.

  1. 01Greenwood68,175
  2. 02Franklin26,158
  3. 03Bargersville11,283
  4. 04New Whiteland5,842
  5. 05Whiteland5,511
  6. 06Edinburgh (part)3,901
  7. 07Trafalgar1,607
  8. 08Prince's Lakes1,372
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Johnson County

The Census 2024 county adjacency file lists 5 neighbors for Johnson County. The most populous is Marion County, IN, with 981,628 residents. Distances run between Census internal points in a straight line.

Distance to Indianapolis and the nearest big city

Indianapolis is 19.2 miles N of Johnson County's internal point in a straight line. The nearest place of 100,000 or more is Indianapolis, IN (population 891,484), 19.6 miles away. The nearest place of 10,000 or more is Franklin, IN (population 26,158), 2.4 miles away.

Johnson County FIPS code

The FIPS code of Johnson County is 18081: state code 18 for Indiana plus county code 081. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $91,676.

Questions people ask

What is the population of Johnson County, Indiana?

The Census Vintage 2024 estimate for July 1, 2024 is 170,614. That is up 8,351 people (5.1%) from the July 2020 estimate of 162,263.

What is the FIPS code of Johnson County?

18081. The first two digits (18) are Indiana; the last three (081) identify the county.

What is the largest town in Johnson County?

Greenwood, with 68,175 residents inside Johnson County in 2024.

Which counties border Johnson County?

5 county-equivalents border it in the Census 2024 adjacency file: Marion County, IN; Bartholomew County, IN; Morgan County, IN; Shelby County, IN; Brown 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.