The Comscore Search report for June has been released. Google had 10.29 billion searches. If roughly the same percentage of searches (20%) had local intent as Google has indicated then there were approximately 2,187,200,000 searches in the U.S. on Google’s main search site last month that were local in nature.
Across all of the search engines, again assuming roughly the same % of local intent, there were 3,187,000,000. A billion here, a billion there, pretty soon you have some real numbers.