#1Kaiser Permanente-Ontario
Serves this area from Ontario, CA (1 mi)
Clinical Research Sites in Ontario, CA
The top-ranked clinical research sites serving Ontario, CA are Kaiser Permanente-Ontario, Kaiser Permanente Ontario Medical Center and Orange County Research Institute. We list 951 clinical research sites serving Ontario, CA. 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 Ontario, CA (San Bernardino County). 951 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 Ontario
#2Kaiser Permanente Ontario Medical Center
Serves this area from Ontario, CA (1 mi)#3Orange County Research Institute
Serves this area from Ontario, CA (4 mi)#4City of Hope Rancho Cucamonga
Serves this area from Rancho Cucamonga, CA (5 mi)#5Prospective Research Innovations Inc.
Serves this area from Rancho Cucamonga, CA (5 mi)#6Rancho Cucamonga Clinical Research
Serves this area from Rancho Cucamonga, CA (5 mi)#7Inland Psychiatric Medical Group.
Serves this area from Chino, CA (5 mi)#8Inland Psychiatric Medical Group (IPMG)-Chino
Serves this area from Chino, CA (5 mi)#9City of Hope at Upland
Serves this area from Upland, CA (6 mi)#10City of Hope Upland
Serves this area from Upland, CA (6 mi)
20 more providers serving this area
- Inland Rheumatology Clinical Trials INC, Upland, CA (6 mi)
- Integrated Research of Inland, Inc., Upland, CA (6 mi)
- Pacific Clinical Research Management Group LLC, Upland, CA (6 mi)
- Catalina Research Institute, LLC, Montclair, CA (6 mi)
- Dream Team Clinical Research, Pomona, CA (8 mi)
- Empire Clinical Research, Pomona, CA (8 mi)
- Empire Clinical Research - Pomona, Pomona, CA (8 mi)
- Pomona Valley Hospital Medical Center, Pomona, CA (8 mi)
- The Neurology Group, Pomona, CA (8 mi)
- Infinity Clinical Research, Norco, CA (8 mi)
- Western University College of Optometry, Pomona, CA (9 mi)
- Western University of Health Sciences, Pomona, CA (9 mi)
- Kaiser Permanente, CA
- Kaiser Permanente-Fontana, CA
- Kaiser Permanente Fontana Medical Center, CA
- Casa Colina Hospital and Centers for Healthcare, Pomona, CA (9 mi)
- Apex Research, Riverside, CA (10 mi)
- Kaiser Permanente, Riverside, CA (10 mi)
- Kaiser Permanente, Riverside, CA (10 mi)
- Kaiser Permanente-Riverside, Riverside, CA (10 mi)
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Frequently asked questions
How many clinical research sites serve Ontario?
We list 951 clinical research sites serving Ontario, CA: 0 based there and 951 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 Ontario?
The top-ranked clinical research sites serving Ontario, CA are Kaiser Permanente-Ontario, Kaiser Permanente Ontario Medical Center, Orange County Research Institute, City of Hope Rancho Cucamonga and Prospective Research Innovations Inc.. The full ranked list, with the official records each provider matched, is on this page.
Which clinical research sites serving Ontario are verified against official records?
10 of the top 10 match an active official record: Kaiser Permanente-Ontario (ClinicalTrials.gov), Kaiser Permanente Ontario Medical Center (ClinicalTrials.gov), Orange County Research Institute (ClinicalTrials.gov), City of Hope Rancho Cucamonga (ClinicalTrials.gov) and Prospective Research Innovations Inc. (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 .