ClinicalTrials.gov currently lists 170,766 studies with locations in all 50 states and in 187 countries.

Locations of Recruiting Studies

Recruiting Study Location Count Pie Chart
Legend for Recruiting Study location pie chart image
Pie ColorLocation
    Non-U.S. Only (51%)
    U.S. Only (43%)
    Both U.S. & Non-U.S. (6%)
Total N = 33,295 studies
Data as of July 10, 2014