Jefferson County
Jefferson County has roughly average household income, with a median household income of $82,851. Population has grown 16% since 2000. Median home value has more than doubled since 2000, reaching $237,200. It ranks in the top 5% of US counties for household income.
Population & growth
PEP 2025 EST:233,132 residents (Census Bureau Vintage 2025, released March 2026)
Income & economy
Housing
Race & ethnicity
Detailed origins & ancestry
+ 39 more ancestry groups with data
Education
Commute & transportation
Work & employment
People & community
Places similar to Jefferson County
Compare Jefferson County to nearby counties
How many people live in Jefferson County, Missouri?
Jefferson County, Missouri has about 229,458 residents according to the 2024 American Community Survey.
What is the median household income in Jefferson County, Missouri?
The typical household in Jefferson County, Missouri earns about $82,851 a year. Half of households make more than that, and half make less.
Is Jefferson County, Missouri expensive?
In Jefferson County, Missouri, the median home is worth about $237,200, and the typical rent is about $979 a month.
How educated are people in Jefferson County, Missouri?
About 24.7% of adults age 25 and over in Jefferson County, Missouri hold a bachelor's degree or higher.
What is the poverty rate in Jefferson County, Missouri?
About 9.0% of people in Jefferson County, Missouri live below the federal poverty line.
Has Jefferson County, Missouri grown since 1990?
Yes, Jefferson County, Missouri has grown since 1990. The population has added about 58,078 residents, a change of about 34 percent over that period.
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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024