St. Joseph demographics profile

StatisticSt. JosephIllinoisNational
Population density (sq mi)1,97322291
Median age34.037.437.7
Male/Female ratio1.0:11.0:11.0:1
Married (15yrs & older)64%55%55%
Speak English99%77%79%
Speak Spanish0%13%13%
St. Joseph, IL has a population of 4,109 and is the 7,329th largest city in the United States. The population density is 1,973 per sq mi which is 788% higher than the Illinois average and 2078% higher than the national average. The median age in St. Joseph is 34 which is approximately 9% lower than the Illinois average of 37. In St. Joseph, 64% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 85% of St. Joseph residents were born in Illinois, 14% were born out of state, 0% were born outside of the United States and 1% were foreign born.

Did you know?

  • The population density in St. Joseph is 788% higher than Illinois.
  • The median age in St. Joseph is 9% lower than Illinois.
  • In St. Joseph 98.08% of the population is Caucasian.
  • In St. Joseph 0.02% of the population is African American.
  • In St. Joseph 0.66% of the population is Asian.

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St. Joseph population breakdown by race

RaceSt. JosephIllinoisNational
African American0.02%14.30%12.63%
American Indian0.00%0.23%0.82%
Native Hawaiian0.00%0.03%0.18%
Mixed race1.24%2.34%3.06%
Other race0.00%5.86%4.75%
In St. Joseph, 0.9% 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.

Languages spoken

Place of birth by citizenship

Household income distribution

Source of income

St. Joseph age breakdown

Marital status

Age of children in married couples

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