Forum Moderators: Robert Charlton & goodroi
The Google Global add-on allows you to localize results down to the zip code level. I know that it works well for seeing localized PPC ads, but I'm not yet convinced about city and state variations in the organic results. I have the sense that IP address and/or cookies may still take precedence.
Also be forewarned, that the issue of ranking is even more complicated than geo-loocation. Google changes results at times depending on the browser in use, or very recent searches from the same computer, and whether the user is signed in to a Google account of some kind.
In addition, any search may be routed to different data centers at different times (even 1 second apart) by Google's load-balancing applications - and different data centers do not always show the same rankings.
We are in a world where the apparently simple question "where does it rank" no longer has a definitive answer.