South River Population, 1860, and 1880 to 2020

Note that before 1880, South River was generally not considered a separate place for the purposes of the Census. Data for all years except 1885, 1905, and 1915, is from the decennial Census of Population, conducted by the U.S. Bureau of the Census. The data for 1860 was taken from Abstract of the Population and Statistics of the State of New Jersey According to the Census of 1860. Trenton: Phillips and Boswell, Printers, 1862. (page 8)
1885, 1905, and 1915 data is from censuses conducted by the State of New Jersey.

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Year Place name Total pop.
1860 Washington 630
1880 Washington (town) - East Brunswick Township 1,081
1885 Washington (town) - East Brunswick Township 1,307
1890 South River (town) - East Brunswick Township 1,796
1900 South River borough 2,792
1905 South River borough 3,585
1910 South River borough 4,772
1915 South River borough 6,691
1920 South River borough 6,596
1930 South River borough 10,759
1940 South River borough 10,714
1950 South River borough 11,308
1960 South River borough 13,397
1970 South River borough 15,428
1980 South River borough 14,361
1990 South River borough 13,692
2000 South River borough 15,322
2010 South River borough 16,008
2020 South River borough 16,118