Move house? To where? In areas with only a single ISP, and that ISP 'owns' the poles/whatever, you can move as much as you want. Nothing changes.
Or did you mean moving to another city? Another part of the country? Really?
It should be obvious that it's perfectly possible to define something as a monopoly in a certain area. If a monopoly could only be defined as a monopoly if it were global, there wouldn't be many.