#1Kaiser Permanente Downey Medical Center
Serves this area from Downey, CA (1 mi)
Clinical Research Sites in Downey, CA
The top-ranked clinical research sites serving Downey, CA are Kaiser Permanente Downey Medical Center, Rancho Los Amigos National Rehabilitation Center and Rancho Research Institute. We list 978 clinical research sites serving Downey, 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 Downey, CA (Los Angeles County). 978 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 Downey
#2Rancho Los Amigos National Rehabilitation Center
Serves this area from Downey, CA (1 mi)#3Rancho Research Institute
Serves this area from Downey, CA (1 mi)#4Center for Clinical Trials, LLC
Serves this area from Paramount, CA (3 mi)#5Clinical Innovations Inc
Serves this area from Bellflower, CA (4 mi)#6Clinical Innovations, Inc, dba CITrials
Serves this area from Bellflower, CA (4 mi)#7Kaiser Permanente-Bellflower
Serves this area from Bellflower, CA (4 mi)#8Kaiser Permanente Bellflower Medical Offices
Serves this area from Bellflower, CA (4 mi)#9Alliance Research Institute - Lynwood
Serves this area from Lynwood, CA (4 mi)#10CNRI Los Angeles LLC
Serves this area from Pico Rivera, CA (4 mi)
20 more providers serving this area
- Golden Optometric Group, West Whittier-Los Nietos, CA (5 mi)
- Alarcon Urology Center, Montebello, CA (5 mi)
- California Research Institute, Huntington Park, CA (6 mi)
- National Research Institute - Huntington Park, Huntington Park, CA (6 mi)
- Valiance Clinical Research, Huntington Park, CA (6 mi)
- Velocity Clinical Research- Huntington Park, Huntington Park, CA (6 mi)
- Helios Clinical Research, Long Beach, CA (6 mi)
- Long Beach Research Institute, Long Beach, CA (6 mi)
- The Oncology Institute of Hope and Innovation, Long Beach, CA (6 mi)
- Core Healthcare Group, Cerritos, CA (6 mi)
- Helios Clinical Research, Cerritos, CA (6 mi)
- Helios CR Inc./RadNet, Cerritos, CA (6 mi)
- Onco Inst of Hope and Innovation, Cerritos, CA (6 mi)
- The Oncology Institute Of Hope And Innovation, Cerritos, CA (6 mi)
- TOI - Clinical Research, Cerritos, CA (6 mi)
- Academic Medical Research Institute, East Los Angeles, CA (6 mi)
- Academic Medical Research Institute (AMRI) - Los Angeles, East Los Angeles, CA (6 mi)
- Academic Medical Research Institute - Glendale, East Los Angeles, CA (6 mi)
- Eastside Clinical Research Associates, East Los Angeles, CA (6 mi)
- Arthur F Gelb MD, Lakewood, CA (6 mi)
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Frequently asked questions
How many clinical research sites serve Downey?
We list 978 clinical research sites serving Downey, CA: 0 based there and 978 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 Downey?
The top-ranked clinical research sites serving Downey, CA are Kaiser Permanente Downey Medical Center, Rancho Los Amigos National Rehabilitation Center, Rancho Research Institute, Center for Clinical Trials, LLC and Clinical Innovations Inc. The full ranked list, with the official records each provider matched, is on this page.
Which clinical research sites serving Downey are verified against official records?
10 of the top 10 match an active official record: Kaiser Permanente Downey Medical Center (ClinicalTrials.gov), Rancho Los Amigos National Rehabilitation Center (ClinicalTrials.gov), Rancho Research Institute (ClinicalTrials.gov), Center for Clinical Trials, LLC (ClinicalTrials.gov) and Clinical 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 .