Stephenson County's estimated 2026 population is 43,018 with a growth rate of -0.47% in the past year according to the most recent United States census data. Stephenson County is the 33rd largest county in Illinois. The 2010 population was 47,606 and has seen a growth of -9.64% since that time.
Data after 2023 is projected based on recent change
Overall: 45.3 years
Female: 47.3 years
Male: 43.2 years
There are 34,472 adults, (10,671 of whom are seniors) in Stephenson County.
Female: 22,364 (51.1%)
Male: 21,404 (48.9%)
The racial composition of Stephenson County includes 79.58% White, 8.63% Black or African American, and smaller percentages for other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 34,830 | 79.58% |
| Black or African American | 3,779 | 8.63% |
| Two or more races | 3,763 | 8.6% |
| Other race | 862 | 1.97% |
| Asian | 361 | 0.82% |
| Native American | 170 | 0.39% |
| Native Hawaiian or Pacific Islander | 3 | 0.01% |
Stephenson County's average per capita income is $44,766. Household income levels show a median of $64,043. The poverty rate stands at 13.93%.
Name | Median | Mean |
|---|---|---|
| Married Families | $95,907 | - |
| Families | $81,855 | $95,729 |
| Households | $64,043 | $79,920 |
| Non Families | $39,078 | $50,923 |
Average Income
Median Household Income
Poverty Rate
