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The first inhabitants of the area known as Old Bridge were the Lenni Lenape Native Americans. Those who settled in Old Bridge were known as the Unami, or “people down the river.” They migrated to the shore along the Raritan each summer from their hunting grounds in the north. When the English gained control from the Dutch in 1664, the state was divided into two provinces, East Jersey and West Jersey. In 1683, the general assembly of East Jersey defined the boundaries of Middlesex County and the three other original counties (Bergen, Essex and Monmouth) as containing all plantations on both sides of the Raritan River, as far as Cheesequake Harbor to the east, then southwest to the Provincial line, with the southwest line being the border of Monmouth and Middlesex Counties and the Township’s southern border.

Thomas Warne, one of the original 24 proprietors of East Jersey, was listed as a landowner of this area, and his son is said to have been the earliest European resident residing in the Cheesequake area in 1683. John and Susannah Brown were granted a 1,000 acres (4.0 km²) land grant from the King of England in 1737. They called the area Brownville, and today this part of town is now known as Browntown.

In 1684, South Amboy Township was formed. At that time, it covered an area that now consists of the Townships of Monroe and Old Bridge, the Borough of Sayreville and the City of South Amboy. The Township covers 42 square miles (110 km²) that separated from South Amboy on March 2, 1869, and was originally called Madison Township. In 1975, the name was changed by referendum to the Township of Old Bridge. The purpose was to establish a single postal designation and ZIP code for the township and to differentiate the township from the Borough of Madison in Morris County. The community of Old Bridge in East Brunswick derives its name from the fact that the first bridge spanning the South River was built there, and as other bridges were built across the river the first one became known as “the Old Bridge.”