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 25,062. South Plainfield is currently growing at a rate of 2.36% annually and its population has increased by 3.21% since the most recent census, which recorded a population of 24,283 in 2020.

25.1K
Total Population
3,021
Density (mi²)
578 2.36%
Growth

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)