South Plainfield is a city located in Middlesex County New Jersey. With a 2020 population of 24,108, it is the 39th largest city in New Jersey and the 1595th largest city in the United States . South Plainfield is currently growing at a rate of 0.12% annually and its population has increased by 3.09% since the most recent census, which recorded a population of 23,385 in 2010. South Plainfield reached it's highest population of 24,108 in 2021. Spanning over 8 miles, South Plainfield has a population density of 2,906 people per square mile.
The average household income in South Plainfield is $110,042 with a poverty rate of 2.77%. The median rental costs in recent years comes to $1,702 per month, and the median house value is $340,200. The median age in South Plainfield is 40.4 years, 38.4 years for males, and 42.2 years for females.