ClinicalTrials.gov currently lists 165,555 studies with locations in all 50 states and in 186 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 = 32,732 studies
Data as of April 21, 2014