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43 states

Where trials are running

Trials cluster hard around a small number of academic centers, so a state with no listing is common and does not mean the research is not happening. Many trials ask participants to travel.

Alabama: 25 trialsAlaska: no trial sites in the registryArizona: 12 trialsArkansas: 15 trialsCalifornia: 116 trialsColorado: 26 trialsConnecticut: 77 trialsDelaware: no trial sites in the registryDistrict of Columbia: 2 trialsFlorida: 37 trialsGeorgia: 48 trialsHawaii: 1 trialIdaho: no trial sites in the registryIllinois: 47 trialsIndiana: 3 trialsIowa: 10 trialsKansas: 9 trialsKentucky: 3 trialsLouisiana: 14 trialsMaine: no trial sites in the registryMaryland: 91 trialsMassachusetts: 56 trialsMichigan: 13 trialsMinnesota: 27 trialsMississippi: 3 trialsMissouri: 22 trialsMontana: 3 trialsNebraska: 10 trialsNevada: 6 trialsNew Hampshire: no trial sites in the registryNew Jersey: 18 trialsNew Mexico: 12 trialsNew York: 107 trialsNorth Carolina: 21 trialsNorth Dakota: no trial sites in the registryOhio: 39 trialsOklahoma: 12 trialsOregon: 7 trialsPennsylvania: 42 trialsRhode Island: 9 trialsSouth Carolina: 20 trialsSouth Dakota: no trial sites in the registryTennessee: 12 trialsTexas: 71 trialsUtah: 23 trialsVermont: 5 trialsVirginia: 7 trialsWashington: 29 trialsWest Virginia: 2 trialsWisconsin: 20 trialsWyoming: no trial sites in the registry
Trials with a site in each state. 43 of 50 states and DC have at least one. Shading is the count, not a judgment: the states with none are the smallest ones, because trials sit where the large academic medical centers are.

Site locations from ClinicalTrials.gov API v2, data build 2026-10-06.