How many physician offices are their in the US? How many total in the world? How many doctors in the US? How many doctors in the world?

You can go to the US Dept of Labor and search that topic for yourself.

U.S. Department of Labor -- Search/A to Z Index (http://www.dol.gov/dol/siteindex.htm)

I saw that same question posted on a Google forum, much like this forum, although the answers given were only for NYC.