I know the ones right around me pretty well but not as well as my neighbors growing up. I am the only single guy on the street, everyone else is either married with kids or are grandparents but I still talk to them when I see them. The family across the street has two girls who I believe are 3 and 6 and when I'm out and they are out I'll play catch with them or help them on their bikes. A couple of times when I had my friends kids over because I was babysitting I would take them out and they'd play with their kids or some of the other kids down the street.
I like knowing my neighbors, it makes it feel like more of a neighborhood.