Medical Information Only. Consult your healthcare provider before enrolling in any clinical trial.
Ohio: below-average open trial sites
2,298 of 6,514 in-state trials are recruiting (35%); below the 37% national average by 2 percentage points.
According to ClinicalTrials.gov-derived indexes, Ohio sits in the upper quartile of US states by in-state trial count (#8 of 52 states by registered in-state trial count).
Ohio: 6,514 US clinical trials with in-state sites, 2,298 recruiting.
Ohio has 6,514 registered US clinical trials with a study site in-state, 2,298 of them currently recruiting (below the 37% national average by 2 percentage points). 998 of these trials are in Phase 3 (late-stage) and 1,446 in Phase 2. The most frequently studied condition in Ohio is Breast Cancer, with 93 linked trials.
Upper-quartile research density
Ohio sits in the upper quartile by in-state trial count. Open share is below the 37% national average by 2 percentage points - denser than most states, still short of the top-decile research hubs.
Below-average open enrollment
Ohio still shows 2,298 recruiting of 6,514 in-state trials (35% open), but below the 37% national average by 2 percentage points, so archived statuses weigh heavier than the national baseline.
- 35%
- open (below national share)
- 2,298
- still recruiting despite cool share
- 1,446
- Phase 2 rows in this footprint
- 93
- top: Breast Cancer
Recruiting share is below the 37% national average by 2 percentage points. Counts include every study with at least one recorded site in the state. Registry reference only, not medical advice.
Ohio 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)
6,514 Top 15% more indexed trials than 85% 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 Ohio 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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Ohio open-enrollment share matches the national baseline.
2,298 of 6,514 in-state trials (35.3%) are recruiting, against 37% nationally (-1.7 percentage points). Counts include every study with at least one recorded site in the state.
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Ohio trial sites spread across 8 city hubs.
Cleveland lists 2,301 of 6,514 in-state trials (35.3%) across 535 named facilities. Cities need five or more listed trials to appear here; locations are as filed by sponsors.
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Breast Cancer is the most-studied condition in Ohio.
93 of 6,514 in-state trials (1.4%) list Breast Cancer. That is a local concentration figure, not a national disease ranking.
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Ohio sponsorship is fragmented across many organizations.
Ohio State University appears on 233 of 6,514 in-state trials (3.6%). Sponsor identity is as filed on ClinicalTrials.gov.
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2,797 Ohio trials carry a completed status.
2,797 of 6,514 (42.9%) are completed. The open share above is the remainder that still lists recruiting.
By Status
| Status | Trial count |
|---|---|
| Completed | 2,797 |
| Recruiting | 2,298 |
| Active | 1,419 |
By Phase
| Phase | Trial count |
|---|---|
| NA | 1,580 |
| Phase 2 | 1,446 |
| Phase 1 | 1,158 |
| Phase 3 | 998 |
| Phase 4 | 283 |
| Early Phase 1 | 56 |
Top Conditions
Top Sponsors
Where trials run in Ohio
Cleveland carries 2,301 of Ohio's 6,514 indexed trials (35%) across 535 named sites, ahead of Columbus at 2,211. 8 cities clear five listed trials, together naming 1,925 distinct sites.
| City | Trials | Listed sites |
|---|---|---|
| Cleveland | 2,301 | 535 |
| Columbus | 2,211 | 519 |
| Cincinnati | 1,892 | 537 |
| Canton | 174 | 75 |
| Toledo | 163 | 87 |
| Dayton | 154 | 93 |
| Akron | 124 | 53 |
| Middleburg Heights | 40 | 26 |
Distinct trials and named sites per city, as filed with ClinicalTrials.gov; cities under five trials omitted. Vintage 2026-08-08.
Recruiting-slot high
Ohio lists 2,298 recruiting trials (p88 by absolute open slots).
Ohio: absolute recruiting slots sit high among states
Sites spread across 8 cities with five or more listed trials, led by Cleveland (2,301, 35% of the state total) and Columbus (2,211), together naming 1,925 distinct research locations.
Phase mix: 998 Phase 3 vs 1,446 Phase 2 (balanced across stages).
Top condition: Breast Cancer (93 trials); top sponsor Ohio State University (233).
high-volume · high-open figures (6,514 trials · 35% open) describe registry geography under the recruiting-slot high read, not clinic capacity or protocol fit. Confirm status on ClinicalTrials.gov before acting.
States near Ohio on absolute recruiting slots
Cross-state peers under the recruiting-slot high read (high-volume · high-open), not the same-state browse list.
Similar high-volume hubs (± open share)
- Maryland · 6,441 trials · 34% recruiting
- Illinois · 6,854 trials · 33% recruiting
- Pennsylvania · 6,946 trials · 34% recruiting
- North Carolina · 5,625 trials · 33% recruiting
- Arizona · 5,607 trials · 30% recruiting
Similar high-open peers (± trial volume)
- Wyoming · 35% recruiting · 17 trials
- Massachusetts · 35% recruiting · 7,667 trials
- New York · 35% recruiting · 10,554 trials
- South Carolina · 35% recruiting · 1,706 trials
- Michigan · 34% recruiting · 4,790 trials