StatisticSt. JosephIowaNational
Population density (sq mi)1405791
Median age14.138.037.7
Male/Female ratio0.5:11.0:11.0:1
Married (15yrs & older)85%60%55%
Families w/ Kids under 1878%44%43%
Speak English95%92%79%
Speak Spanish5%4%13%

Key findings

  • The population density in St. Joseph is 146% higher than Iowa
  • The median age in St. Joseph is 63% lower than Iowa
  • In St. Joseph 100.00% of the population is White
  • In St. Joseph 0.00% of the population is Black
  • In St. Joseph 0.00% of the population is Asian

Compare St. Joseph, IA Demographics


      St. Joseph population breakdown by race

      RaceSt. JosephIowaNational
      American Indian0.00%0.32%0.82%
      Native Hawaiian0.00%0.08%0.18%
      Mixed race0.00%1.97%3.06%
      Other race0.00%1.27%4.75%
      In St. Joseph, 0.0% 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

      St. Joseph age breakdown

      Marital status

      Age of children in married couples

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