Stephenson County's estimated 2025 population is 42,203 with a growth rate of -1.06% 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 -11.35% since that time.
Data after 2023 is projected based on recent change
The racial composition of Stephenson County includes 82.09% White, 8.43% Black or African American, and smaller percentages for other race, Asian, Native American and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 36,152 | 82.09% |
| Black or African American | 3,714 | 8.43% |
| Two or more races | 3,215 | 7.3% |
| Other race | 493 | 1.12% |
| Asian | 355 | 0.81% |
| Native American | 113 | 0.26% |
Married
Widowed
Divorced
Separated
Never Married
Stephenson County's average per capita income is $43,138. Household income levels show a median of $61,943. The poverty rate stands at 13.13%.
Name | Median | Mean |
|---|---|---|
| Married Families | $91,306 | $106,379 |
| Families | $79,462 | $94,132 |
| Households | $61,943 | $78,072 |
| Non Families | $35,291 | $48,910 |
Average Income
Median Household Income
Poverty Rate
