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

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