Medical Information Only. Consult your healthcare provider before enrolling in any clinical trial.
Clinical trials in Wisconsin
659 of 1,760 in-state trials are recruiting (37%); roughly in line with the 37% national average, with Phase 2 weight.
According to ClinicalTrials.gov-derived indexes, Wisconsin sits in the lower half of US states by in-state trial count (#30 of 52 states by registered in-state trial count).
Wisconsin: 1,760 US clinical trials with in-state sites, 659 recruiting.
Wisconsin has 1,760 registered US clinical trials with a study site in-state, 659 of them currently recruiting (roughly in line with the 37% national average). 187 of these trials are in Phase 3 (late-stage) and 403 in Phase 2. The most frequently studied condition in Wisconsin is Healthy, with 45 linked trials.
Lower-half Wisconsin archive
Wisconsin's in-state trials target 53,462 patients on average (p100 by trial size among 52 states with enrollment data), larger, multi-site studies than most states. Treat this page as a compact local index (mid-volume · high-open), then jump to recruiting trials or methodology rather than expecting hub-scale coverage.
In-line with national open share
Wisconsin tracks 1,760 in-state trials with 659 open (37%), roughly in line with the 37% national average within about 1-2 points of the 37% national figure.
- 37%
- open (near national share)
- 659
- recruiting participants now
- 187
- Phase 3 (late-stage)
- 45
- top: Healthy
Recruiting share is roughly in line with the 37% national average. Counts include every study with at least one recorded site in the state. Registry reference only, not medical advice.
Wisconsin vs all states by indexed in-state trial count
Where this state's ClinicalTrials.gov site count sits among every state with at least one listed trial (coverage density, not care quality)
1,760 Top 58% more indexed trials than 42% of 52 states
States, banded by indexed in-state trial count
Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source ClinicalTrials.gov · 2026-08-08
Key findings
What ClinicalTrials.gov does not surface for Wisconsin on its own pages , computed from the registry mirror as of 2026-08-08. Each line carries its own denominator so it can be quoted as it stands.
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Wisconsin open-enrollment share matches the national baseline.
659 of 1,760 in-state trials (37.4%) are recruiting, against 37% nationally (+0.4 percentage points). Counts include every study with at least one recorded site in the state.
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Wisconsin trial sites spread across 8 city hubs.
Madison lists 867 of 1,760 in-state trials (49.3%) across 277 named facilities. Cities need five or more listed trials to appear here; locations are as filed by sponsors.
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Healthy is the most-studied condition in Wisconsin.
45 of 1,760 in-state trials (2.6%) list Healthy. That is a local concentration figure, not a national disease ranking.
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One sponsor accounts for a large share of Wisconsin trials.
University of Wisconsin, Madison appears on 338 of 1,760 in-state trials (19.2%). Sponsor identity is as filed on ClinicalTrials.gov.
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730 Wisconsin trials carry a completed status.
730 of 1,760 (41.5%) are completed. The open share above is the remainder that still lists recruiting.
Where trials run in Wisconsin
Madison carries 867 of Wisconsin's 1,760 indexed trials (49%) across 277 named sites, ahead of Milwaukee at 719. 8 cities clear five listed trials, together naming 584 distinct sites.
| City | Trials | Listed sites |
|---|---|---|
| Madison | 867 | 277 |
| Milwaukee | 719 | 226 |
| La Crosse | 40 | 19 |
| Wauwatosa | 29 | 20 |
| Marshfield | 28 | 11 |
| Eau Claire | 23 | 9 |
| West Bend | 19 | 7 |
| Green Bay | 17 | 15 |
Distinct trials and named sites per city, as filed with ClinicalTrials.gov; cities under five trials omitted. Vintage 2026-08-08.
Trial size large
Wisconsin's in-state trials target 53,462 patients on average (p100 by trial size among 52 states with enrollment data), larger, multi-site studies than most states.
Wisconsin: in-state trial volume sits mid-pack
Sites spread across 8 cities with five or more listed trials, led by Madison (867, 49% of the state total) and Milwaukee (719), together naming 584 distinct research locations.
Phase mix: 187 Phase 3 vs 403 Phase 2 (early-phase heavy).
Top condition: Healthy (45 trials); top sponsor University of Wisconsin, Madison (338).
mid-volume · high-open figures (1,760 trials · 37% open) describe registry geography under the trial size large read, not clinic capacity or protocol fit. Confirm status on ClinicalTrials.gov before acting.
States near Wisconsin on in-state trial volume
Cross-state peers under the trial size large read (mid-volume · high-open), not the same-state browse list.
Similar mid-volume peers (± open share)
- South Carolina · 1,706 trials · 35% recruiting
- Louisiana · 1,936 trials · 28% recruiting
- Iowa · 1,544 trials · 33% recruiting
- Oregon · 1,999 trials · 34% recruiting
- Kansas · 2,080 trials · 29% recruiting
Similar high-open peers (± trial volume)
- Texas · 37% recruiting · 9,951 trials
- Utah · 38% recruiting · 1,734 trials
- West Virginia · 36% recruiting · 277 trials
- Minnesota · 36% recruiting · 4,506 trials
- Massachusetts · 35% recruiting · 7,667 trials