This is a very nice municipal campground run by the city of Mayville. It is located adjacent to the Rainbow Rose garden and sculpture park, and opposite the large beautiful Island Park which has myriad recreational opportunities (see link here: https://www.mayvilleportland.com/things-to-do/parks-recreation/)
The campsites themselves are fairly small and open and close together , but the grounds are well kept and the proximity to the beautiful city park is a real plus. Note that you need to call Jeremy, the parks officer, to make a reservation, and you usually need to leave a voice message and he will call back to help you make arrangments. The number to call is 701-430-7177. This is a convenient and pleasant location to camp if visiting Mayville.