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is a charter township of Kent County in the U.S. state of Michigan. The population was 30,195 at the 2000 census. The township forms part of the metro Grand Rapids area. The township derives its name from the extinct lumbertown of Plainfield founded in 1838 by Andrew Stout at the intersection of the Rogue and Grand Rivers. The town name was eventually changed to Austerlitz before its eventual dissolution. Plainfield township is borderd by Alpine Township to the west, Algoma Township to the north, Cannon Township to the east, and by Grand Rapids Township to the south.
The Grand River forms the dominant geographical feature of the township, and it features many parks along its banks with available swimming and boating. The township's main roadway is Plainfield Avenue, which is a state highway with the designation M-44 Connector. This highway intersects with M-44 near the point where it crosses the Grand River.
According to the United States Census Bureau, the township has a total area of 36.5 square miles (94.6 km²), of which, 35.1 square miles (91.0 km²) of it is land and 1.4 square miles (3.6 km²) of it (3.78%) is water.