South Plainfield Flag

South Plainfield

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.

24K
Total Population
2,896
Density (mi²)
-52 -0.22%
Growth

South Plainfield Population

South Plainfield Population

Data after 2023 is projected based on recent change

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 (54.9%)

Asian (16.0%)

Black or African American (11.0%)

Other race (9.2%)

Two or more races (8.4%)

Native American (0.5%)

Native Hawaiian or Pacific Islander (0.0%)

Race
Population
Percentage (of total)
White13,31654.95%
Asian3,87916.01%
Black or African American2,65510.96%
Other race2,2279.19%
Two or more races2,0268.36%
Native American1220.5%
Native Hawaiian or Pacific Islander60.02%

South Plainfield Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

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

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)