Arnold

County:: Jefferson County
County Seat:: No
Area (mi²):: 11.528
State:: Missouri

Arnold is a city located in Jefferson County, Missouri. Arnold has a 2025 population of 21,196. Arnold is currently growing at a rate of 0.33% annually and its population has increased by 1.64% since the most recent census, which recorded a population of 20,853 in 2020.

The average household income in Arnold is $88,067 with a poverty rate of 7.71%. The median age in Arnold is 39.9 years: 38.7 years for males, and 42.9 years for females.

Demographics

The racial composition of Arnold includes 90.9% White, and smaller percentages for Asian, other race, Black or African American, Native Hawaiian or Pacific Islander, Native American and multiracial populations.

Population by Race

White

Two or more races

Asian

Other race

Black or African American

Native Hawaiian or Pacific Islander

Native American

Race	Population	Percentage (of total)
White	18,984	90.9%
Two or more races	1,538	7.36%
Asian	218	1.04%
Other race	91	0.44%
Black or African American	42	0.2%
Native Hawaiian or Pacific Islander	8	0.04%
Native American	3	0.01%

Arnold Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Arnold's average per capita income is $46,549. Household income levels show a median of $75,194. The poverty rate stands at 7.71%.

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	$102,862	-
Families	$90,766	$102,549
Households	$75,194	$88,067
Non Families	$40,236	$54,425

$46,549

Average Income

$75,194

Median Household Income

7.71%

Poverty Rate