Jefferson

County:: Greene County
County Seat:: Yes
Area (mi²):: 6.016
State:: Iowa

Jefferson is a city located in Greene County, Iowa. Jefferson has a 2025 population of 4,046. It is also the county seat of Greene County. Jefferson is currently declining at a rate of -0.66% annually and its population has decreased by -3.21% since the most recent census, which recorded a population of 4,180 in 2020.

The average household income in Jefferson is $73,678 with a poverty rate of 8.42%.The median age in Jefferson is 51.5 years: 43.5 years for males, and 57.4 years for females.

Demographics

The racial composition of Jefferson includes 93.76% White, and smaller percentages for other race, Black or African American and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	3,904	93.76%
Two or more races	218	5.24%
Other race	30	0.72%
Black or African American	12	0.29%

Jefferson Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Jefferson's average per capita income is $46,250. Household income levels show a median of $54,286. The poverty rate stands at 8.42%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$100,234	-
Families	$85,625	$97,838
Households	$54,286	$73,678
Non Families	$38,750	$46,514

$46,250

Average Income

$54,286

Median Household Income

8.42%

Poverty Rate