South Plainfield is a medium-sized borough located in the state of New Jersey. With a population of 24,228 people and seven associated neighborhoods, South Plainfield is the 79th largest community in New Jersey.

Housing costs in South Plainfield are among some of the highest in the nation, although real estate prices here don't compare to real estate prices in the most expensive communities in New Jersey.

Also of interest is that South Plainfield has more people living here who work in computers and math than 95% of the places in the US.

A relatively large number of people in South Plainfield telecommute to their jobs. Overall, about 12.04% of the workforce works from home. While this may seem like a small number, as a fraction of the total workforce it ranks among the highest in the country. These workers are often telecommuters who work in knowledge-based, white-collar professions. For example, Silicon Valley has large numbers of people who telecommute. Other at-home workers may be self-employed people who operate small businesses out of their homes.

Because of many things, South Plainfield is a great place for families with children to consider. First of all, many other families with children live here, making South Plainfield a place where both parents and children are more likely to develop social ties with other families, as well as find family-oriented services and community. The borough’s good public school district and large population of college-educated adults provide an environment conducive to academic values. With regard to real estate, South Plainfield has a high rate of owner-occupied single family homes, which tends to reflect stability in the local community. Finally, South Plainfield’s overall crime rate is lower than average for the country.

South Plainfield is one of the most well-educated cities in the nation. 43.00% of adults in South Plainfield have at least a bachelor's degree. Compare that to the average community in America, which has just 21.84% with a bachelor's degree or higher.

The per capita income in South Plainfield in 2022 was $48,206, which is middle income relative to New Jersey, and wealthy relative to the rest of the US. This equates to an annual income of $192,824 for a family of four.

South Plainfield is an extremely ethnically-diverse borough. The people who call South Plainfield home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of South Plainfield residents report their race to be White, followed by Asian. South Plainfield also has a sizeable Hispanic population (people of Hispanic origin can be of any race). People of Hispanic or Latino origin account for 18.44% of the borough’s residents. Important ancestries of people in South Plainfield include Italian, Irish, German, Polish, and English.

Foreign born people are also an important part of South Plainfield's cultural character, accounting for 23.92% of the borough’s population.

The most common language spoken in South Plainfield is English. Other important languages spoken here include Spanish and Langs. of India.