Ever heard of Monowi, Nebraska? It has a population of one.
Monowi was platted in 1902, when the Fremont, Elkhorn and Missouri Valley Railroad was extended to that point. A post office was established in Monowi in 1902 and remained in operation until 1967.
Monowi's peak years were in the 1930s, when it had a population of 150. Like many other small communities in the Great Plains, it lost its younger residents to cities that were experiencing growth and offering better jobs. During the 2000 census, the village had a total population of two; only one married couple, Rudy and Elsie Eiler, lived there. Rudy died in 2004, leaving his wife as the only remaining resident. In this capacity, she acts as mayor, granting herself a liquor license and paying taxes to herself. She is required to produce a municipal road plan every year in order to secure state funding for the village's four street lights.
All emphasis are mine.
So, if you live in undesirable land, live off the grid, don't plat the place, make no municipal road plan and keep population to a minimum, you might just be able to pull it off.
About 5.08% of Wisconsin's area is federal land, mostly in the North. You might be able to evade scrutiny from the State of Wisconsin as long as you hide in there, but then you have to hide from Uncle Sam himself. Depending on where his focus in on the moment it might be easier or harder to hide. So you might wish to stick to places close to the border of federal and state lands and live nomadically.