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 2026 population of 25,451. South Plainfield is currently growing at a rate of 0.77% annually and its population has increased by 4.81% since the most recent census, which recorded a population of 24,283 in 2020.

The median household income in South Plainfield is $130,239 with a poverty rate of 2.98%. The median age in South Plainfield is 41.7 years: 40.3 years for males, and 43 years for females. For every 100 females there are 100.1 males.

25.5K
Total Population
3,068
Density (mi²)
195 0.77%
Growth

South Plainfield Population

South Plainfield Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202625,4511950.77%
202525,2561940.77%
202425,0625782.36%
202324,4841970.81%
202224,287-10-0.04%
202124,297-33-0.14%
202024,2832360.98%
201924,047270.11%
201824,020570.24%
201723,963950.4%
201623,868210.09%
201523,8472080.88%
201423,639610.26%
201323,578180.08%
201223,5601160.49%
201123,444570.24%
201023,38720.01%
200021,8101,3216.45%
199020,489-32-0.16%
198020,521-621-2.94%
197021,1423,26318.25%
196017,8799,871123.26%
19508,0082,62948.88%
19405,3793326.58%
19305,04700%

Median Age

Overall: 41.7 years
Female: 43 years
Male: 40.3 years

South Plainfield Adults

There are 19,352 adults, (4,758 of whom are seniors) in South Plainfield.

Sex Ratio

Female: 12,229 (50%)
Male: 12,244 (50%)

Demographics

The racial composition of South Plainfield includes 50.46% White, 21.32% Asian, 9.97% Black or African American, 7.18% other race, and smaller percentages for Native American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White12,34950.46%
Asian5,21721.32%
Two or more races2,49410.19%
Black or African American2,4419.97%
Other race1,7567.18%
Native American2160.88%
Race
Population ↓
Percentage (of total)
Two or more races1,7357.09%
Other race1,5546.35%
White6232.55%
Native American1810.74%
Black or African American660.27%
Race
Population ↓
Percentage (of total)
White11,72647.91%
Asian5,21721.32%
Black or African American2,3759.7%
Two or more races7593.1%
Other race2020.83%
Native American350.14%

South Plainfield Marital Status

Economics and Income Statistics

South Plainfield 's average per capita income is $72,089. Household income levels show a median of $130,239. The poverty rate stands at 2.98%.

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$158,974-
Families$146,655$164,045
Households$130,239$148,575
Non Families$57,619$76,381

$72,089

Average Income

$130,239

Median Household Income

2.98%

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)