Oconto is a city in Oconto County, Wisconsin, United States. It is part of the Green Bay Metropolitan Statistical Area. The city is located partially within the town of Oconto. Oconto is home to Copper Culture State Park, which has remains dated to around 5000-6000 B.C. It is a burial ground of the Copper Culture Indians. This burial ground is considered to be the oldest cemetery in Wisconsin and one of the oldest in the nation.