South Plainfield, New Jersey

South Plainfield population, 2020 to 2024

South Plainfield added 779 residents from July 2020 to July 2024, a change of +3.2%. In the latest year it moved by +578. Among 194 New Jersey places of 5,000 or more, that growth ranks 43rd; the median place changed by +1.8%. The median place of 5,000+ in New Jersey has 11,231 people, so South Plainfield is 2.2 times that size.

South Plainfield covers 8.30 square miles of land and 0.04 of water, for 3,020 people per square mile of land. The median New Jersey place of 5,000+ has 4,474, so South Plainfield is less dense than the typical town.

What county South Plainfield is in

All of South Plainfield's residents live in Middlesex County, which had 890,119 residents in 2024. South Plainfield holds 2.8% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in South Plainfield

1 ZIP Code Tabulation Area (ZCTA) overlaps South Plainfield by at least 10% of the ZCTA's or the borough's land: 07080. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a borough that annexed land after 2020 may reach into ZIP codes not listed here.

Where South Plainfield is

The Census internal point of South Plainfield is at 40.574400, -74.414800. Trenton, the capital, is 30.3 miles SW in a straight line. The nearest larger place is Plainfield, NJ (56,507 people), 2.9 miles away. The nearest city of 100,000 or more is Elizabeth, NJ, 13.2 miles away.

Daylight in South Plainfield

At 40.57° N, South Plainfield gets about 15 h 05 min of daylight around the June solstice and 9 h 16 min around the December solstice, a swing of 5 h 49 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near South Plainfield

The eight nearest incorporated places of 1,000+ in New Jersey, measured between internal points. The closest is Plainfield, 2.8 miles away, with 56,507 people.