ClinicalTrials.gov currently lists 175,798 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 = 33,988 studies
Data as of October 01, 2014