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As of the 2010 United States Census, Stephenson County, located in the Prairie State, had a total population of 47,053 people.
From a total population of 47,053, Stephenson County has a median age of 44.2. The average age of males, in Stephenson County, is 43.2 while the average age of females is 45.1. When you compare this to median age of Illinois, Stephenson County is 7.2 years older.
The median income of individuals, in Stephenson County, is $23,686 while the average household income is $44,631. When comparing the median income of people living in Stephenson County to the rest of Illinois, the average income in Stephenson County is $6,333 less.