Richard Wilson 
And then the Town Took Off [PDF ebook] 

The town of Superior, Ohio, certainly was living up to its name. In what was undoubtedly the most spectacular feat of the century, it simply picked itself up one night and rose two full miles above Earth. Radio messages stated simply that Superior had seceded from Earth. But Don Cort, stranded on that rising town, was beginning to suspect that nothing was simple about Superior except its citizens. Now it was up to Cort: either find a way to anchor Superior, or spend the rest of his days on the smallest–and the nuttiest–planet in the galaxy!