ClinicalTrials.gov currently lists 145,461 studies with locations in all 50 states and in 185 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 (50%)
    U.S. Only (44%)
    Both U.S. & Non-U.S. (6%)
Total N = 30,277 studies
Data as of May 17, 2013