I think DC is actually a bad example of this, in the sense that people whose kids reach school age leave very quickly. A quick look at the demographic data of

I think DC is actually a bad example of this, in the sense that people whose kids reach school age leave very quickly. A quick look at the demographic data of the public school population shows that the newcomers aren't adding to the public school population. Either they don't have school age kids, or they are putting their kids in private school. Other cities won't have this issue though.