Johnson County's estimated 2026 population is 13,379 with a growth rate of 0.12% in the past year according to the most recent United States census data. Johnson County is the 77th largest county in Illinois. The 2010 population was 12,598 and has seen a growth of 6.2% since that time.
Data after 2023 is projected based on recent change
Overall: 41.4 years
Female: 43.5 years
Male: 40.5 years
There are 10,893 adults, (2,630 of whom are seniors) in Johnson County.
Female: 5,706 (42.7%)
Male: 7,670 (57.3%)
The racial composition of Johnson County includes 80.53% White, 7.8% Black or African American, and smaller percentages for other race, Asian and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 10,772 | 80.53% |
| Two or more races | 1,399 | 10.46% |
| Black or African American | 1,043 | 7.8% |
| Other race | 129 | 0.96% |
| Asian | 33 | 0.25% |
Johnson County's average per capita income is $45,304. Household income levels show a median of $62,528. The poverty rate stands at 17.58%.
Name | Median | Mean |
|---|---|---|
| Married Families | $89,563 | - |
| Families | $79,509 | $91,906 |
| Households | $62,528 | $78,647 |
| Non Families | $39,832 | $52,994 |
Average Income
Median Household Income
Poverty Rate
