Population density (sq mi)1,1595791
Median age39.138.037.7
Male/Female ratio0.9:11.0:11.0:1
Married (15yrs & older)64%60%55%
Families w/ Kids under 1852%44%43%
Speak English89%92%79%
Speak Spanish1%4%13%

Key findings

  • The population density in Johnston is 1933% higher than Iowa
  • The median age in Johnston is 3% higher than Iowa
  • In Johnston 92.23% of the population is White
  • In Johnston 2.07% of the population is Black
  • In Johnston 3.90% of the population is Asian

Compare Johnston, IA Demographics


      Johnston population breakdown by race

      American Indian0.07%0.32%0.82%
      Native Hawaiian0.27%0.08%0.18%
      Mixed race1.37%1.97%3.06%
      Other race0.10%1.27%4.75%
      In Johnston, 2.2% of people are of Hispanic or Latino origin.
      Please note: Hispanics may be of any race, so also are included in any/all of the applicable race categories above.

      Household income distribution

      Place of birth by citizenship

      Johnston age breakdown

      Marital status

      Age of children in married couples

      Source: The Johnston, IA demographics data displayed above is derived from the 2016 United States Census Bureau American Community Survey (ACS).