South River

County:: Middlesex County
County Seat:: No
Area (mi²):: 2.785
State:: New Jersey

South River is a borough located in Middlesex County, New Jersey. South River has a 2025 population of 15,851. South River is currently declining at a rate of -0.25% annually and its population has decreased by -1.25% since the most recent census, which recorded a population of 16,051 in 2020.

The average household income in South River is $120,913 with a poverty rate of 11.3%. The median age in South River is 36.5 years: 35.6 years for males, and 37.6 years for females.

Demographics

The racial composition of South River includes 58.09% White, 16.04% other race, 11.78% Black or African American, 4.25% Asian, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Other race

Black or African American

Two or more races

Asian

Native American

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	9,298	58.09%
Other race	2,567	16.04%
Black or African American	1,886	11.78%
Two or more races	1,394	8.71%
Asian	681	4.25%
Native American	151	0.94%
Native Hawaiian or Pacific Islander	30	0.19%

South River Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

South River's average per capita income is $56,234. Household income levels show a median of $101,853. The poverty rate stands at 11.3%.

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	$129,102	-
Families	$116,548	$129,588
Households	$101,853	$120,913
Non Families	$63,269	$90,117

$56,234

Average Income

$101,853

Median Household Income

11.3%

Poverty Rate