"About 48 percent of the population inside micropolitan statistical areas lived in incorporated places, while about 52 percent lived in unincorporated areas"
https://www.census.gov/population/www/documentation/twps0082...
anecdotally the pursuit of not being around "public services" is a large part of the motivation. Personally as I'm leaving my 20s far behind I realize all the neon and jazz of the city did nothing but pacify a deeper realization that a more clear seeming experience of mind was on hold or somehow diluted...convenience can be very distracting.
... hopefully this makes some kind of sense. different kinds of folks/values. a lot of my peers live right in the city, which makes sense. convenience of stores / hospitals etc for raising a family. for me alone give me 50 acres and a 2 bdrm ranch home. and an invisible driveway :)
in all of the US 62% live in incorporated areas.
United States 281,423,231 175,062,893 62.2 106,360,338 37.8
https://www.census.gov/population/www/documentation/twps0082...
https://en.wikipedia.org/wiki/Bel_Marin_Keys,_California
That's an unincorporated area, populated by an affluent community, with all the services you'd expect.
I think the answer is actually in the negative becuase the common amenities include pretty basic services like roads, police protection, or grid power. As far as I'm aware that level of disconnect is very rare.