Fond du Lac is a city in and the county seat of Fond du Lac County, Wisconsin, United States. The population was 44,678 at the 2020 ce…Fond du Lac is a city in and the county seat of Fond du Lac County, Wisconsin, United States. The population was 44,678 at the 2020 census. The city forms the core of the Fond du Lac metropolitan statistical area, which includes all of Fond du Lac County. Fond du Lac is the 348th-largest metropolitan area in the United States.
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