Jefferson County, MO — Demographics & Population
Population, age distribution, race & ethnicity, and education data
Population Overview
Source: Census Bureau ACS (2023)Total Population
228,227
Male
114,066
50.0%
Female
114,161
50.0%
Median Age
40.2 yrs
Avg Household Size
2.6
Foreign Born
2.2%
Race & Ethnicity
Source: Census Bureau ACS (2023)Age Distribution
Source: Census Bureau ACS (2023)Education
Source: Census Bureau ACS (2023)Bachelor's or Higher16.5%
High School or Higher38.6%
Other Demographics
Source: Census Bureau ACS (2023)Veterans
6.1%
Disability
0.0%
Non-English Home
6.0%
Married
44.7%
Jefferson County, MO has a population of 228,227 according to 2023 Census Bureau estimates. The median age is 40.2 years. The largest racial or ethnic group is White at 90.0% of the population. 16.5% of residents hold a bachelor's degree or higher. 2.2% of residents are foreign-born.