When I was growing up living in PA and then in S.C., I knew pretty much everyone in our neighborhood. Since I moved to CA, people seem to keep to themselves but in my parents neighborhood they've gotten to know some of their neighbors.

I live in a condo complex and I've only gotten to know a few neighbors because I've had water leaking problems. I really don't chat with any one and people tend to move out of their condos a lot so you never know who your current neighbors even are. I'm not the type to introduce myself to strangers very easily so I tend to just say hi and that's it.