Johnson County Demographics

A map of Johnson County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	139,520	136,748	83.9%	84.5%
Asian	8,486	7,420	5.1%	4.6%
Hispanic	7,159	6,394	4.3%	4.0%
Black	5,378	3,850	3.2%	2.4%
Multiracial	5,234	6,381	3.1%	3.9%
Native American/Other	538	972	0.3%	0.6%

Johnson County, Indiana has an estimated population of 166,315, a slight increase from the 161,765 recorded in the 2020 Census. The population is 83.9% White, 5.1% Asian, 4.3% Hispanic, 3.2% Black, 3.1% Multiracial, and 0.3% Native American/Other. This demographic dot map shows the population of Johnson County, with one dot drawn for each person counted by the Census, color-coded by race.

Johnson has become more racially diverse since the 2020 Census. It is considerably less diverse than Indiana overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Johnson County, that probability was 28.0% in 2020 and 29.0% in the most recent ACS estimates.

Johnson County is ranked the 11th most populous county in Indiana, out of 92 counties. Johnson County was ranked the 11th most populous county in the 2020 Census.

Johnson County's White Population

139,520 residents of Johnson County, or 83.9% of the population, identify as White. The share of White residents in Johnson County is higher than in Indiana overall, where 75.4% of the population is White. Johnson County ranks 68th statewide in terms of White residents as a share of the population, out of 92 counties.

Since the 2020 Census, Johnson County's White population has grown by an estimated 2.0%. White residents' share of Johnson County's population has decreased from 84.5% to 83.9%.

Johnson County is more White than neighboring Marion County (49.5% White), and Bartholomew County (77.7% White). Johnson County is less White than neighboring Shelby County (89.8% White), Brown County (94.2% White), and Morgan County (93.5% White).

Johnson County's Black Population

5,378 residents of Johnson County, or 3.2% of the population, identify as Black. The share of Black residents in Johnson County is lower than in Indiana overall, where 9.1% of the population is Black. Johnson County ranks 25th statewide in terms of Black residents as a share of the population, out of 92 counties.

Since the 2020 Census, Johnson County's Black population has grown by an estimated 39.7%. Black residents' share of Johnson County's population has increased from 2.4% to 3.2%.

Johnson County is more Black than neighboring Shelby County (1.4% Black), Brown County (0.3% Black), Morgan County (0.8% Black), and Bartholomew County (1.8% Black). Johnson County is less Black than neighboring Marion County (27.1% Black).

Johnson County's Asian Population

8,486 residents of Johnson County, or 5.1% of the population, identify as Asian. The share of Asian residents in Johnson County is slightly higher than in Indiana overall, where 2.6% of the population is Asian. Johnson County ranks 6th statewide in terms of Asian residents as a share of the population, out of 92 counties.

Since the 2020 Census, Johnson County's Asian population has grown by an estimated 14.4%. Asian residents' share of Johnson County's population has increased from 4.6% to 5.1%.

Johnson County is more Asian than neighboring Marion County (4% Asian), Shelby County (1% Asian), Brown County (0.6% Asian), and Morgan County (0.5% Asian). Johnson County is less Asian than neighboring Bartholomew County (7.4% Asian).

Johnson County's Hispanic Population

7,159 residents of Johnson County, or 4.3% of the population, identify as Hispanic. The share of Hispanic residents in Johnson County is slightly lower than in Indiana overall, where 8.6% of the population is Hispanic. Johnson County ranks 37th statewide in terms of Hispanic residents as a share of the population, out of 92 counties.

Since the 2020 Census, Johnson County's Hispanic population has grown by an estimated 12.0%. Hispanic residents' share of Johnson County's population has remained roughly unchanged at 4.3%.

Johnson County is more Hispanic than neighboring Brown County (1.9% Hispanic), and Morgan County (2.1% Hispanic). Johnson County is less Hispanic than neighboring Marion County (13.8% Hispanic), Shelby County (5.6% Hispanic), and Bartholomew County (9.2% Hispanic).

Johnson County's Native American/Other Population

538 residents of Johnson County, or 0.3% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Johnson County is comparable to the share in Indiana overall, where 0.5% of the population is Native American/Other. Johnson County ranks 18th statewide in terms of Native American/Other residents as a share of the population, out of 92 counties.

Since the 2020 Census, Johnson County's Native American/Other population has declined by an estimated 44.7%. Native American/Other residents' share of Johnson County's population has remained roughly unchanged at 0.3%.

Johnson County is more Native American/Other than neighboring Shelby County (0.1% Native American/Other). Johnson County is less Native American/Other than neighboring Marion County (0.7% Native American/Other), Brown County (0.7% Native American/Other), and Bartholomew County (0.5% Native American/Other).

Johnson County's Multiracial Population

5,234 residents of Johnson County, or 3.1% of the population, identify as Multiracial. The share of Multiracial residents in Johnson County is comparable to the share in Indiana overall, where 3.8% of the population is Multiracial. Johnson County ranks 21st statewide in terms of Multiracial residents as a share of the population, out of 92 counties.

Since the 2020 Census, Johnson County's Multiracial population has declined by an estimated 18.0%. Multiracial residents' share of Johnson County's population has decreased from 3.9% to 3.1%.

Johnson County is more Multiracial than neighboring Shelby County (2.1% Multiracial), Brown County (2.3% Multiracial), and Morgan County (2.7% Multiracial). Johnson County is less Multiracial than neighboring Marion County (4.9% Multiracial), and Bartholomew County (3.4% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.