South Plainfield, New Jersey Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of South Plainfield, New Jersey is 24,231 as of the 2023 American Community Survey, making it the 43rd-largest city in New Jersey. The median household income is $126,063, the median home value is $443,900, and the median age is 41.7.
The population has grown 7.2% since 2010 (23,383 → 25,062).
24,231
Population
2921
People / sq mi
$126,063
Median Income
$443,900
Median Home Value
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South Plainfield covers 8.3 sq mi of land at 2921 people per square mile.
About South Plainfield, NJ
Homeownership is the standout figure in South Plainfield: 85.2% of homes are owner-occupied, higher than the national rate. With 24,231 residents, South Plainfield is a city in New Jersey. It ranks #43 among cities in New Jersey by population.
The typical household earns $126,063 a year, above the US median of $78,538. Only 3.0% of residents live in poverty, below the national 12.4%. Home values run above average at $443,900, with typical rent around $1,928.
Degree attainment is mid-range for US cities: 42.0% of adults hold a four-year degree, above the national 35.0%. About 12.3% of the workforce is home-based, below the national 14.0%, and the average commute runs about 28 minutes each way.
The ownership rate anchors the housing story in South Plainfield, and tends to move with the age structure and home-value figures above.
South Plainfield borough Population History (2010-2024)
The city of South Plainfield borough had a population of 23,383 in 2010 and 25,062 in 2024, a 7.2% growth over 14 years. The peak was 25,062 in 2024. Average annual growth rate: 0.50%.
25,062
Population (2024)
23,383
Population (2010)
25,062
Peak (2024)
0.50%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 23,383 |
| 2011 | 23,440 |
| 2012 | 23,555 |
| 2013 | 23,573 |
| 2014 | 23,635 |
| 2015 | 23,842 |
| 2016 | 23,867 |
| 2017 | 23,965 |
| 2018 | 24,024 |
| 2019 | 24,052 |
| 2020 | 24,283 |
| 2021 | 24,297 |
| 2022 | 24,287 |
| 2023 | 24,484 |
| 2024 | 25,062 |
Race & Ethnicity
| White | 55.0% |
| Black or African American | 11.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.2% |
| Two or More Races | 0.0% |
Economy & Income
$126,063
Median Household Income
$49,533
Per Capita Income
3.0%
Poverty Rate
5.0%
Unemployment Rate
Housing
$443,900
Median Home Value
$1,928
Median Rent
85.2%
Owner-Occupied
Education
92.5%
High School+
42.0%
Bachelor's+
Commute
2.1%
Drive Alone
75.6%
Public Transit
12.3%
Work From Home
28.0 min
Avg Commute
Community Profile
15.2%
Foreign Born
67.4%
Non-English at Home
3.2%
Veterans
10.0%
With Disability
96.7%
Health Insurance
95.8%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 24.3% |
| Finance, Insurance & Real Estate | 13.2% |
| Manufacturing | 10.1% |
| Retail Trade | 8.4% |
| Public Administration | 7.9% |
| Information | 7.9% |
| Construction | 5.8% |
| Education, Health Care & Social Services | 3.9% |
| Arts, Entertainment & Food Services | 3.9% |
| Transportation & Warehousing | 2.2% |
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City rankings
Frequently Asked Questions
South Plainfield, New Jersey has a population of 24,231 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 43rd-largest city in New Jersey.
The median household income in South Plainfield, New Jersey is $126,063, with 3.0% of residents living below the federal poverty level.
The median home value in South Plainfield, New Jersey is $443,900, with median monthly rent at $1,928 and a homeownership rate of 85.2%.
The median age in South Plainfield, New Jersey is 41.7 years. The population is 49.6% male and 50.4% female.
The population has grown 7.2% since 2010 (23,383 → 25,062).
South Plainfield borough, NJ Climate
South Plainfield borough, NJ has an average annual temperature of 11.8°C (53°F) and receives about 1246 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
11.8°C
Avg Temp
1246
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -1° / 30° | 99 mm |
| February | 0° / 33° | 77 mm |
| March | 5° / 41° | 104 mm |
| April | 11° / 51° | 103 mm |
| May | 16° / 62° | 116 mm |
| June | 21° / 70° | 100 mm |
| July | 24° / 75° | 130 mm |
| August | 23° / 74° | 113 mm |
| September | 19° / 67° | 110 mm |
| October | 13° / 55° | 93 mm |
| November | 7° / 45° | 104 mm |
| December | 2° / 35° | 97 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit South Plainfield borough, NJ
The most comfortable months to visit South Plainfield borough, NJ are typically June, September and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 30°C high). The coldest is January (near -6°C low). July is usually the wettest month.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.