Google has started delivering customized search results for local searches.
Customized Search Results
How does Google decide which queries are getting which area’s results?
If I were to venture a guess, I would say they will begin distributing search results within a scheme similar to Nielsen’s Designated Market Areas (DMA).
The timing for this new type of search result appears to coincide with the present United States economic cycle.
More about Google’s new customized search results:
Search Customization Details
Search Customization Details
Search Marketing Communications 
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