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Clinical Research Sites in St. Clair County, IL

The top-ranked clinical research sites serving St. Clair County, IL are Cancer Care Center of O'Fallon, Cancer Care Specialists of Central Illinois and Cancer Care Specialists of Illinois. We list 174 clinical research sites serving St. Clair County, IL. 30 of the providers shown match an active record from ClinicalTrials.gov, checked on the date shown. Rankings follow our published methodology; sponsored placements never change rank.

Clinical Research Sites serving St. Clair County, IL. 174 providers, 10 of the top 10 verified against federal or state records. Registry records checked on 2026-11-04.

Top 10 ranked clinical research sites for St. Clair County

Ranked by our published methodology. Sponsored providers are shown separately.
#ProviderVerified recordsBased inPhone
1Cancer Care Center of O'FallonSite on 247 active studies registered on ClinicalTrials.gov
O'Fallon, IL—
2Cancer Care Specialists of Central IllinoisSite on 3 active studies registered on ClinicalTrials.gov
O'Fallon, IL—
3Cancer Care Specialists of IllinoisSite on 3 active studies registered on ClinicalTrials.gov
O'Fallon, IL—
4Cancer Care Specialists of Illinois - Cancer Care Center of O'FallonSite on 2 active studies registered on ClinicalTrials.gov
O'Fallon, IL—
5Cancer Care Specialists of Illinois-SwanseaSite on 6 active studies registered on ClinicalTrials.gov
Swansea, IL—
6Gateway Clinical TrialsSite on 5 active studies registered on ClinicalTrials.gov
O'Fallon, IL—
7Hospital Sisters Health System (HSHS) - St Elizabeth's HospitalSite on 2 active studies registered on ClinicalTrials.gov
O'Fallon, IL—
8HSHS Saint Elizabeth's HospitalSite on 97 active studies registered on ClinicalTrials.gov
O'Fallon, IL—
9HSHS St. Elizabeth's HospitalSite on 2 active studies registered on ClinicalTrials.gov
O'Fallon, IL—
10Memorial HospitalSite on 7 active studies registered on ClinicalTrials.gov
O'Fallon, IL—
20 more providers serving this area

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Frequently asked questions

How many clinical research sites serve St. Clair County?

We list 174 clinical research sites serving St. Clair County, IL: 14 based there and 160 serving it from nearby. 10 of the top 10 match an active federal or state record, checked on 2026-11-04.

Which clinical research sites serve St. Clair County?

The top-ranked clinical research sites serving St. Clair County, IL are Cancer Care Center of O'Fallon, Cancer Care Specialists of Central Illinois, Cancer Care Specialists of Illinois, Cancer Care Specialists of Illinois - Cancer Care Center of O'Fallon and Cancer Care Specialists of Illinois-Swansea. The full ranked list, with the official records each provider matched, is on this page.

Which clinical research sites serving St. Clair County are verified against official records?

10 of the top 10 match an active official record: Cancer Care Center of O'Fallon (ClinicalTrials.gov), Cancer Care Specialists of Central Illinois (ClinicalTrials.gov), Cancer Care Specialists of Illinois (ClinicalTrials.gov), Cancer Care Specialists of Illinois - Cancer Care Center of O'Fallon (ClinicalTrials.gov) and Cancer Care Specialists of Illinois-Swansea (ClinicalTrials.gov), and 5 more on this page. Each badge links to the official record it matched.

How are these companies ranked?

By our published methodology: verified registrations, documented capabilities, years registered and responsiveness. Sponsored placements are shown separately and never affect rank.

What does "Verified" mean on this page?

"Verified" means we matched the provider to an active official record on the date shown; each badge links to that record. The absence of a badge only means we have not verified that item.

How do sponsors judge a research site?

Common checks are enrollment history in the indication, experienced coordinators, IRB arrangements, start-up time and data quality. ClinicalTrials.gov shows which studies a site has been listed on.

"Verified" means we matched the provider to an active official record on the date shown. The absence of a badge only means we have not verified that item. How we rank and verify. Page updated .

Communities served

Belleville, O'Fallon, East St. Louis, Cahokia Heights, Fairview Heights, Shiloh, Swansea, Mascoutah, Lebanon, Freeburg, Caseyville, Millstadt, Smithton, Dupo, Washington Park, Fairmont City, New Athens, Marissa, Brooklyn, St. Libory, Lenzburg, East Carondelet, Summerfield, Fayetteville, Sauget, Darmstadt, Floraville, Rentchler, Paderborn

More areas nearby

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