Plainfield is a village in Waushara County, Wisconsin, United States. A tiny portion extends into adjacent Town of Oasis. The village is located almost entirely within the Town of Plainfield. The population was 899 at the 2000 census.
Plainfield is located at 44°12′42″N 89°29′34″W / 44.21167°N 89.49278°W / 44.21167; -89.49278 (44.211943, -89.492803).
According to the United States Census Bureau, the village has a total area of 1.3 square miles (3.4 km²). None of the area is covered with water.