ClinicalTrials.gov currently lists 177,688 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 Color Location
color Non-U.S. Only (52%)
color U.S. Only (43%)
color Both U.S. and Non-U.S. (6%)
Total N = 34,171 studies
Data as of October 29, 2014