ClinicalTrials.gov currently lists 188,494 studies with locations in all 50 states and in 190 countries.

Locations of Recruiting Studies

Recruiting Study Location Count Pie Chart
Legend for Recruiting Study location pie chart image
Pie Color Location
color Non-U.S. Only (53%)
color U.S. Only (41%)
color Both U.S. and Non-U.S. (6%)
Total N = 35,077 studies
Data as of April 16, 2015