ClinicalTrials.gov currently lists 186,941 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 (52%)
color U.S. Only (42%)
color Both U.S. and Non-U.S. (6%)
Total N = 34,908 studies
Data as of March 25, 2015