Mayville is a city in Dodge County, Wisconsin, United States, located along the Rock River and the Horicon Marsh. The population was 5,196 at t…Mayville is a city in Dodge County, Wisconsin, United States, located along the Rock River and the Horicon Marsh. The population was 5,196 at the 2020 census. Mayville was platted in 1845, by the May brothers and others, and named for the former. A post office has been in operation at Mayville since 1847. The city was incorporated in 1885.
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