Johnson County's estimated 2026 population is 13,250 with a growth rate of -0.26% in the past year according to the most recent United States census data. Johnson County is the 78th largest county in Illinois. The 2010 population was 12,598 and has seen a growth of 5.18% since that time.
Data after 2023 is projected based on recent change
The racial composition of Johnson County includes 82.18% White, 7.57% Black or African American, and smaller percentages for other race, Asian and multiracial populations.
White (82.18%)
Two or more races (9.26%)
Black or African American (7.57%)
Other race (0.75%)
Asian (0.25%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 10,971 | 82.18% |
| Two or more races | 1,236 | 9.26% |
| Black or African American | 1,010 | 7.57% |
| Other race | 100 | 0.75% |
| Asian | 33 | 0.25% |
Married
Widowed
Divorced
Separated
Never Married
Johnson County's average per capita income is $43,021. Household income levels show a median of $65,203. The poverty rate stands at 16.67%.
Name | Median | Mean |
|---|---|---|
| Married Families | $90,357 | - |
| Families | $77,213 | $89,276 |
| Households | $65,203 | $77,971 |
| Non Families | $39,566 | $54,571 |
Average Income
Median Household Income
Poverty Rate
