Sorry, was just following the original suggestion and as I'm not too familiar with the US thought their must be some reason for Austin and Ann Arbor. Austin I've seen in discussions about tech centres, Ann Arbor I know nothing about.
Edit: I'd also make Michigan into "Michigan/Ohio/Pittsburgh", add "Mountain States (Arizona/Utah/Colorado/NM/ID)", and add Other Midwest, and Other South. Then I'd leave it alone. :)
This looks like it might have been flagged down so might need a new poll in the morning.
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Edit: OK did all of that. I think this won't make it to morning on the front page so perhaps someone else can submit a new poll based on this in the morning, maybe with some more options for SF and we can get a fuller picture.
Nice work. Oh well, even if this poll is on its way off HN's front page, glad to help you learn the geography of the US. :)