St. Joseph is a city located in Illinois. St. Joseph has a 2020 population of 5,519. St. Joseph is currently declining at a rate of -1.62% annually and its population has decreased by -6.30% since the most recent census, which recorded a population of 5,890 in 2010. St. Joseph reached it's highest population of 5,993 in 2014.
The average household income in St. Joseph is $97,404 with a poverty rate of 4.34%. The median rental costs in recent years comes to $794 per month, and the median house value is $191,200. The median age in St. Joseph is 37.3 years, 35.8 years for males, and 39.3 years for females.