I know that Google tells you how many times a certain keyword is used in a search. You can use the Google Keyword Tool for that. This tool also allows you to find out the number of "local" searches: this is the number of times a person from a given country searches for this keyword.
My questions: can you also find out how many searches originate from a given American state ? In the Keyword Tool, I can only select countries, not states.
Any other systems I can use to determine where people are searching for a given keyword?