South Plainfield

County:: Middlesex County
County Seat:: No
Area (mi²):: 8.296
State:: New Jersey

South Plainfield is a borough located in Middlesex County, New Jersey. South Plainfield has a 2025 population of 24,027. South Plainfield is currently declining at a rate of -0.22% annually and its population has decreased by -1.07% since the most recent census, which recorded a population of 24,286 in 2020.

The average household income in South Plainfield is $143,868 with a poverty rate of 3.55%. The median age in South Plainfield is 41.7 years: 39.7 years for males, and 43.1 years for females.

Demographics

The racial composition of South Plainfield includes 54.95% White, 16.01% Asian, 10.96% Black or African American, 9.19% other race, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Asian

Black or African American

Other race

Two or more races

Native American

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	13,316	54.95%
Asian	3,879	16.01%
Black or African American	2,655	10.96%
Other race	2,227	9.19%
Two or more races	2,026	8.36%
Native American	122	0.5%
Native Hawaiian or Pacific Islander	6	0.02%

South Plainfield Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

South Plainfield's average per capita income is $69,114. Household income levels show a median of $126,063. The poverty rate stands at 3.55%.

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	$156,857	-
Families	$148,080	$158,717
Households	$126,063	$143,868
Non Families	$58,494	$68,305

$69,114

Average Income

$126,063

Median Household Income

3.55%

Poverty Rate