Plainfield is a city in Union County, New Jersey, United States. As of the 2010 United States Census, the city's population increased to 49,808, the highest ever recorded population in any decennial census. Plainfield was originally formed as a township on April 5, 1847, from portions of Westfield Township, while the area was still part of Essex County. On March 19, 1857, it became part of the newly created Union County. Plainfield was incorporated as a city by an Act of the New Jersey Legislature on April 21, 1869, from portions of Plainfield Township, based on the results of a referendum... held that same day. The city and township coexisted until March 6, 1878, when Plainfield Township was dissolved and parts were absorbed by Plainfield city, with the remainder becoming Fanwood Township . Plainfield is nicknamed "The Queen City". Plainfield is located at 40°36′56″N 74°24′57″W / 40.615444°N 74.415775°W / 40.615444; -74.415775 . According to the United States Census Bureau, the city had a total area of 6.034 square miles , of which, 6.023 square miles of it is land and 0.
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| County: | Union County |
| State: | New Jersey |
| Country: | United States of America |
| Population: | 46,318 |
| Area: | 6 sq. mi. |
| Time zone: | North American Eastern Time Zone |
| Also known as: | Plainfield, New Jersey, Union County / Plainfield city |