Jefferson County's estimated 2026 population is 234,130 with a growth rate of 0.43% in the past year according to the most recent United States census data. Jefferson County is the 7th largest county in Missouri. The 2010 population was 219,130 and has seen a growth of 6.85% since that time.
Data after 2023 is projected based on recent change
Overall: 40.3 years
Female: 41.1 years
Male: 39.7 years
There are 177,825 adults, (38,261 of whom are seniors) in Jefferson County.
Female: 114,708 (50%)
Male: 114,750 (50%)
The racial composition of Jefferson County includes 89.29% White, and smaller percentages for Asian, Black or African American, other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 204,876 | 89.29% |
| Two or more races | 17,493 | 7.62% |
| Asian | 2,358 | 1.03% |
| Black or African American | 2,315 | 1.01% |
| Other race | 2,018 | 0.88% |
| Native American | 351 | 0.15% |
| Native Hawaiian or Pacific Islander | 47 | 0.02% |
Jefferson County's average per capita income is $53,166. Household income levels show a median of $82,851. The poverty rate stands at 9.03%.
Name | Median | Mean |
|---|---|---|
| Married Families | $112,610 | $124,314 |
| Families | $98,453 | $112,063 |
| Households | $82,851 | $98,813 |
| Non Families | $44,776 | $60,053 |
Average Income
Median Household Income
Poverty Rate
