Plainfield is located in the northern part of the state of New Jersey and a city in Union County and is in the base of the Watchung Mountains. In 1685, the Quakers settled in the area where the present-day Plainsfield stands, and the site came to be known as Milltown, because of its large gristmill, that was established in the latter part of the 1700s. However, the name of the area was then changed to Plainfield in the 1800s and was later incorporated in 1847 as a township. At present, the city is a residential southwestern suburb of the New York City region and is in the focal point for several surrounding towns that include the North and South Plainfield.

Population 50,588  (5.70%)

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