Clay County's estimated 2026 population is 12,573 with a growth rate of -0.98% in the past year according to the most recent United States census data. Clay County is the 81st largest county in Illinois. The 2010 population was 13,822 and has seen a growth of -9.04% since that time.
Data after 2023 is projected based on recent change
The racial composition of Clay County includes 95.36% White, and smaller percentages for Black or African American, Asian, other race, Native American and multiracial populations.
White (95.36%)
Two or more races (3.2%)
Black or African American (0.71%)
Asian (0.3%)
Other race (0.22%)
Native American (0.2%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 12,562 | 95.36% |
| Two or more races | 422 | 3.2% |
| Black or African American | 93 | 0.71% |
| Asian | 40 | 0.3% |
| Other race | 29 | 0.22% |
| Native American | 27 | 0.2% |
Married
Widowed
Divorced
Separated
Never Married
Clay County's average per capita income is $42,406. Household income levels show a median of $57,266. The poverty rate stands at 16.71%.
Name | Median | Mean |
|---|---|---|
| Married Families | $88,616 | - |
| Families | $74,401 | $99,498 |
| Households | $57,266 | $79,425 |
| Non Families | $36,364 | $43,701 |
Average Income
Median Household Income
Poverty Rate