Johnson County Demographics

A map of Johnson County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	472,604	460,399	76.1%	75.5%
Hispanic	57,813	54,389	9.3%	8.9%
Asian	32,309	32,856	5.2%	5.4%
Black	29,831	28,092	4.8%	4.6%
Multiracial	24,867	29,793	4.0%	4.9%
Native American/Other	3,207	4,334	0.5%	0.7%

Johnson County, Kansas has an estimated population of 620,631, a slight increase from the 609,863 recorded in the 2020 Census. The population is 76.1% White, 9.3% Hispanic, 5.2% Asian, 4.8% Black, 4.0% Multiracial, and 0.5% 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 slightly less racially diverse since the 2020 Census. It is less diverse than Kansas 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 41.5% in 2020 and 40.5% in the most recent ACS estimates.

Johnson County is ranked the most populous county in Kansas, out of 105 counties. Johnson County was ranked the 1st most populous county in the 2020 Census.

Johnson County's White Population

472,604 residents of Johnson County, or 76.1% of the population, identify as White. The share of White residents in Johnson County is slightly higher than in Kansas overall, where 72.7% of the population is White. Johnson County ranks 85th statewide in terms of White residents as a share of the population, out of 105 counties.

Since the 2020 Census, Johnson County's White population has grown by an estimated 2.7%. White residents' share of Johnson County's population has increased from 75.5% to 76.1%.

Johnson County is more White than neighboring Wyandotte County (36.4% White), Douglas County (76% White), and Jackson County (59.3% White). Johnson County is less White than neighboring Miami County (89.9% White), and Leavenworth County (77.4% White).

Johnson County's Black Population

29,831 residents of Johnson County, or 4.8% of the population, identify as Black. The share of Black residents in Johnson County is comparable to the share in Kansas overall, where 5.2% of the population is Black. Johnson County ranks 9th statewide in terms of Black residents as a share of the population, out of 105 counties.

Since the 2020 Census, Johnson County's Black population has grown by an estimated 6.2%. Black residents' share of Johnson County's population has remained roughly unchanged at 4.8%.

Johnson County is more Black than neighboring Miami County (1.2% Black), and Douglas County (4.2% Black). Johnson County is less Black than neighboring Wyandotte County (18.1% Black), Leavenworth County (6.8% Black), and Jackson County (22% Black).

Johnson County's Asian Population

32,309 residents of Johnson County, or 5.2% of the population, identify as Asian. The share of Asian residents in Johnson County is slightly higher than in Kansas overall, where 2.9% of the population is Asian. Johnson County ranks 1st statewide in terms of Asian residents as a share of the population, out of 105 counties.

Since the 2020 Census, Johnson County's Asian population has declined by an estimated 1.7%. Asian residents' share of Johnson County's population has remained roughly unchanged at 5.2%.

Johnson County is more Asian than neighboring Miami County (0.1% Asian), Leavenworth County (1.3% Asian), Douglas County (4.3% Asian), and Jackson County (1.8% Asian).

Johnson County's Hispanic Population

57,813 residents of Johnson County, or 9.3% of the population, identify as Hispanic. The share of Hispanic residents in Johnson County is slightly lower than in Kansas overall, where 13.6% of the population is Hispanic. Johnson County ranks 35th statewide in terms of Hispanic residents as a share of the population, out of 105 counties.

Since the 2020 Census, Johnson County's Hispanic population has grown by an estimated 6.3%. Hispanic residents' share of Johnson County's population has remained roughly unchanged at 9.3%.

Johnson County is more Hispanic than neighboring Miami County (4.1% Hispanic), Leavenworth County (7.6% Hispanic), and Douglas County (7.2% Hispanic). Johnson County is less Hispanic than neighboring Wyandotte County (34.1% Hispanic), and Jackson County (11.4% Hispanic).

Johnson County's Native American/Other Population

3,207 residents of Johnson County, or 0.5% 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 Kansas overall, where 0.9% of the population is Native American/Other. Johnson County ranks 58th statewide in terms of Native American/Other residents as a share of the population, out of 105 counties.

Since the 2020 Census, Johnson County's Native American/Other population has declined by an estimated 26.0%. Native American/Other residents' share of Johnson County's population has remained roughly unchanged at 0.5%.

Johnson County is more Native American/Other than neighboring Miami County (0.2% Native American/Other). Johnson County is less Native American/Other than neighboring Wyandotte County (1.1% Native American/Other), Leavenworth County (1% Native American/Other), Douglas County (1.5% Native American/Other), and Jackson County (0.9% Native American/Other).

Johnson County's Multiracial Population

24,867 residents of Johnson County, or 4.0% of the population, identify as Multiracial. The share of Multiracial residents in Johnson County is comparable to the share in Kansas overall, where 4.8% of the population is Multiracial. Johnson County ranks 29th statewide in terms of Multiracial residents as a share of the population, out of 105 counties.

Since the 2020 Census, Johnson County's Multiracial population has declined by an estimated 16.5%. Multiracial residents' share of Johnson County's population has decreased from 4.9% to 4.0%.

Johnson County is less Multiracial than neighboring Wyandotte County (5.1% Multiracial), Miami County (4.5% Multiracial), Leavenworth County (5.9% Multiracial), Douglas County (6.8% Multiracial), and Jackson County (4.6% 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.