(And even then you'd think neighbours and acquaintances would have noticed save in the case of a wizarding family that lived in greatest isolation from other magical people.)
I was thinking about this - the impression you get in the books is that by and large they *don't* know each other before arrival.
It's not like "Oh, Ron, how've you been since I saw you last month?" - it mostly looks like a whole bunch of new-forming friendships, with a few exceptions. (Draco/Crabbe/Goyle, for example, where it's pretty clear their parents see each other regularly.)
It's not just the Muggle-born (where it'd make sense) - but you'd think that if there was a lot of cross-family visiting, Ron would know a few people and point them out, rather than immediately falling in with Harry and Hermione sort of out of default - there's got to be friends of his brothers around somewhere, right?
And you get the sense in the Quidditch Championship that most of the younger set aren't used to the large community gathering stuff either.
Given that, I don't think it's impossible you'd have rather isolated wizarding families. Maybe there's something about not being able to use the floo network until you have your own wand or something else that's a natural age-limiter for under 11. So you'd see the people near your home, but not most others without a lot of extra effort.
Re: But then Questions Arise...
I was thinking about this - the impression you get in the books is that by and large they *don't* know each other before arrival.
It's not like "Oh, Ron, how've you been since I saw you last month?" - it mostly looks like a whole bunch of new-forming friendships, with a few exceptions. (Draco/Crabbe/Goyle, for example, where it's pretty clear their parents see each other regularly.)
It's not just the Muggle-born (where it'd make sense) - but you'd think that if there was a lot of cross-family visiting, Ron would know a few people and point them out, rather than immediately falling in with Harry and Hermione sort of out of default - there's got to be friends of his brothers around somewhere, right?
And you get the sense in the Quidditch Championship that most of the younger set aren't used to the large community gathering stuff either.
Given that, I don't think it's impossible you'd have rather isolated wizarding families. Maybe there's something about not being able to use the floo network until you have your own wand or something else that's a natural age-limiter for under 11. So you'd see the people near your home, but not most others without a lot of extra effort.