ClinicalTrials.gov currently lists 132,381 studies with locations in all 50 states and in 179 countries.

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Registered Study Locations

Study Location Count Pie Chart
    Non-U.S. Only (42%)
    U.S. Only (42%)
    Not Specified (10%)
    Both U.S. & Non-U.S. (6%)
Total N = 132,381 studies
Data as of September 11, 2012