Little kid's knee-riding rhyme

[Rapid T Rabbit]

I found a webpage of rhymes that mother's recite to their toddlers when bouncing them on their knee like riding a pony. One of them goes like this:


Trot, trot, to Boston;
Trot, trot, to Lynn;
Trot, trot, to Salem;
Home, home again.

Hmm....anybody notice what (at least two of) those places have in common?