[lonnyk]

> is it because US school are larger & fewer

I don't know because I know very little about schools outside the US. My best guess would be that they vary everywhere and this isn't US specific.

> Assuming you were in a city rather than a rural area

Before I was born and when I was younger there were quite a few farms, but I didn't grow up with them. So I suppose it used to be rural and now is a suburb (in-between rural and a city). My town has about ~30k people.

There are a lot of sprawling cities (and I _think_ Boston may be one of those) where it would also be greater distances to walk to a school. ..so I'm not sure being a city is correlated to short walking distances to school.