How many gynecologist are there in the US?

Answer 1

661, 400

There are 661, 400 physicians and surgeons in the United States in 2008. This is according to the 2010 Statistical Abstract of the U.S. Census Bureau. This represents about 12% of all healthcare professionals and 0.6% of all employed persons in the United States. 30.5% of all doctors are female and 16.6% are Asian.

Answer 2

according to http://www.bls.gov/oes/current/naics4_621100.htm
in 2008 there were 15,770 Obstetricians and Gynecologists in the US. they earn ~$200,000\ per year ($95.48 per hour)