I dread that question. I filled out something the other day that (US-specific) that asked for my "hometown." So I asked my husband what my hometown should be. He just shrugged. I left it blank. Ha.
I've lived in 7 states, total, and moved 6 times in the past 5 years and that's just TMI for some poor unsuspecting asker.

So if it's just a random, casual question, I just say Boston. Which is a lie, because I've never actually lived in Boston, but instead, across the river in Cambridge. But when in the UK, even fellow Americans seem to think I mean THIS Cambridge.
Digging a little deeper, I'll say that we moved from Boston, but that I grew up in PA and RI. Invariably, that triggers the person to say that they're from Baltimore and I am compelled to admit that that's where I'm REALLY from, as I was born there and my extended family is there.
