Johnson County Population 2018

Johnson County's estimated population is 591,178 with a growth rate of 1.11% in the past year according to the most recent United States census data. Johnson County is the 1st largest county in Kansas.

Year Population Growth Growth Rate
2017591,1786,4621.11%
2016584,7165,7961.00%
2015578,9206,0351.05%
2014572,8856,5981.17%
2013566,2876,8991.23%
2012559,3886,6281.20%
2011552,7607,0521.29%
2010545,708190,65453.70%
1990355,05484,78531.37%
1980270,26952,60724.17%
1970217,66273,87051.37%
1960143,79281,009129.03%
195062,78329,45688.38%
194033,3276,14822.62%
193027,1798,86548.41%
192018,314260.14%
191018,2881841.02%
190018,1047194.14%
189017,3855323.16%
188016,8533,16923.16%
187013,6849,320213.57%
18604,3640.00%

Johnson County Population Growth

Population Data via

Johnson County Race Data

Race Population Percentage
White506,39485.66%
Black or African American28,2354.78%
Asian27,5384.66%
Two or More Races13,9192.35%
American Indian and Alaska Native2,4790.42%
Native Hawaiian and Other Pacific Islander1930.03%

Johnson County Population Pyramid

0k5k10k15k20k Male Population0k5k10k15k20k Female Population8580757065605550454035302520151050
Data Sources
  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990