South River, New Jersey

South River population, 2020 to 2024

South River added 342 residents from July 2020 to July 2024, a change of +2.1%. In the latest year it moved by +228. Among 194 New Jersey places of 5,000 or more, that growth ranks 75th; the median place changed by +1.8%. The median place of 5,000+ in New Jersey has 11,231 people, so South River is 1.5 times that size.

South River covers 2.79 square miles of land and 0.16 of water, for 5,875 people per square mile of land. The median New Jersey place of 5,000+ has 4,474, so South River is denser than the typical town.

What county South River is in

All of South River's residents live in Middlesex County, which had 890,119 residents in 2024. South River holds 1.8% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in South River

1 ZIP Code Tabulation Area (ZCTA) overlaps South River by at least 10% of the ZCTA's or the borough's land: 08882. 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 River is

The Census internal point of South River is at 40.445700, -74.378500. Trenton, the capital, is 25.2 miles SW in a straight line. The nearest larger place is Sayreville, NJ (47,165 people), 3.4 miles away. The nearest city of 100,000 or more is Elizabeth, NJ, 18.1 miles away.

Daylight in South River

At 40.45° N, South River gets about 15 h 04 min of daylight around the June solstice and 9 h 17 min around the December solstice, a swing of 5 h 47 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near South River

The eight nearest incorporated places of 1,000+ in New Jersey, measured between internal points. The closest is Milltown, 3.0 miles away, with 7,170 people.