Google sent me a warning message saying my email was accessed from TX. I live in FL. Should I be worried about this?

Google sent me a message telling me my email was accessed from Texas. I live in Florida. Is this just some weird gateway/access thing, or should I be concerned?

I'm guessing it's probably nothing, but I changed my password just in case.

If you go to GeoIP and punch in the IP address (64.134.148.24) you can look at the map and see that it's coming from Dallas/Fort Worth, TX. When you zoom all the way in it looks as though it's someone's house. Is that anywhere close to being accurate? How do these things work?

Edit: Oops, sorry, here's the message: http://i.imgur.com/TG0kw.png