ClinicalTrials.gov currently lists 187,290 studies with locations in all 50 states and in 188 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 (42%)
color Both U.S. and Non-U.S. (6%)
Total N = 35,006 studies
Data as of March 30, 2015