Doctors & clinics in Ontario, CA
320 doctors & clinics listed in Ontario, California. 288 with a phone number and 286 with a website.
Ontario accounts for 0% of the doctors & clinics listed in California and ranks #57 among California cities for doctors & clinics.
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Ontario, CA has 320 doctors & clinics listed on USA Business Search. 288 list a phone number and 286 list a website. The most listings are in ZIP codes 91761, 91762, 91764.
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STC Plastic Surgery
California Medical Clinic
Unicare Community Health Center
Healthpointe
Kaiser Permanente
1801 Excise Avenue Llc
909 Motoring
Abbid Shah, MD | Kaiser Permanente
Abid Hameed Khan M.d., Inc.
Acapulco Travel & Tours Inc
Accuquest Hearing Centers
Advanced Analytical Testing
Advanced Care Foot and Ankle
Advanced Hair Restoration
Adventist Health Managed Care
Aimee Lai Quan, MD | Kaiser Permanente
Alan Kuo, MD | Kaiser Permanente
Alexander Kyung Jin Han, MD | Kaiser Permanente
Alireza Heshmat, MD | Kaiser Permanente
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Alison Shin-hwa Taur, MD | Kaiser Permanente
Alphafits Nutrition
Ambulatory Surgery Center
American Pediatrics
Andrew George, DPM
Angeles Health Center
Anthony Edward Kimball, DPM | Kaiser Permanente
Anupam Mittal, DO | Kaiser Permanente
Arrowhead Aesthetic Plastic Surgery Associates
Arsenio Javier Figueroa, MD | Kaiser Permanente
Arti Jayant Choure, MD | Kaiser Permanente
Audrey C. Yun, DO | Kaiser Permanente
Autism Learning Partners Ontario
Avisa Abaian, MD | Kaiser Permanente
Azar Foot and Ankle Specialist
Babytree Surrogacy
Behavior Frontiers Autism Center
Benjamin Maurice Kershberg, MD | Kaiser Permanente
Binny Abraham, MD | Kaiser Permanente
Bio Rad Laboratories
Bonnie Brae Home (ICF/DD-H)
Bosley - Hair Restoration & Transplant - Ontario
Brad A Katzman, DPM
Brandon Edward Chock, MD | Kaiser Permanente
Brio Clinical
Britt Allen Miller, MD | Kaiser Permanente
Bryan Vincent Wiley, MD | Kaiser Permanente
Bryan Yen-liang Liou, MD | Kaiser Permanente
Bryant Tran, DO | Kaiser Permanente
Calibrated Healthcare
California Pain & Wellness
California Surgical Institute Of Ontario
California surrogacy agency
California Vein Vascular And Diagnostics, Inc.
Cardinal Health
Casa De La Salud Natural
Catherine Ann Walsh, MD | Kaiser Permanente
Cecilia Munoz
Central Occupational Medical Providers - Comp
Centrelake Imaging
Charles I-hong Lu, MD | Kaiser Permanente
Christina T Deedas D.O.| Kaiser Permanente
Christine Kim Bui, DO | Kaiser Permanente
Christine L Vuong D.O.| Kaiser Permanente
Christopher Bing Yan, MD | Kaiser Permanente
Clarence A Hamilton M.D.
Clarissa Grace Lew, DO | Kaiser Permanente
Claudia Rico, MD | Kaiser Permanente
Clifford Chimaobi Eke, MD | Kaiser Permanente
Clinica Medica Familiar
Concentra Urgent Care
Concentra Urgent Care
Covidien
Daisy M Khoo-miyaki D.O.
Daniel Ting-hao Hsu, MD | Kaiser Permanente
Darryn K. Wong, DO | Kaiser Permanente
Dat Man Ha, DO | Kaiser Permanente
David Changshung Liu, MD | Kaiser Permanente
David D. Diep, DO | Kaiser Permanente
David Gerald Talukdar, MD | Kaiser Permanente
David Joshua Hall, DO | Kaiser Permanente
David Vinton Anderson, MD | Kaiser Permanente
DaVita Ace Acute
DaVita Ontario Dialysis
DaVita Ontario Mills Dialysis
Devin Edwin Shahverdian, MD | Kaiser Permanente
Dialysis Center Of Ontario, LLC
Diane D Branks DPM| Kaiser Permanente
Docs4Truckers
Doh Joon Park, DO | Kaiser Permanente
DOT CDL Physical Exam Ontario at Truck Stop
Dot Physicals By Ontario Testing Center
Douglas Do MD | Kaiser Permanente
Dr. Aaron R. Allen, MD
Dr. Catareya P. Liep, MD
Dr. Clayton E. Patchett
Dr. Danese Hayes
Dr. David Lozano
Dr. Jose de la Llana MD
Dr. Michael Wach
Dr. Rajiv Bhagat, D.d.s., Inc.
Dr. Robert Chong
Dr. Roman A. Shulze, DO
Drs Yu & Xu Dental Corporation
Dsm Nutritional Products
Dung Anh Nguyen, MD | Kaiser Permanente
Edmond C. Hui, MD | Kaiser Permanente
Edward Chang MD | Kaiser Permanente
Edward Hal Brunngraber, MD | Kaiser Permanente
Elizabeth Jude Durano Canete, MD | Kaiser Permanente
Empire Vein and Vascular Specialists
Eric M Wong M.D.
Expocell Group Inc
Family Foot Center Podiatry Group
Femcare Medical Associates
Ferrin Ruiz
First Health Dme
Footheals Podiatry
Frances McIntyre, DO | Kaiser Permanente
Fred Lai, MD | Kaiser Permanente
Gabriel Tomas Trainer, MD | Kaiser Permanente
Gilbert Y. Cheung, MD | Kaiser Permanente
Global Lasik And Cataract Institute - Ontario
Global Vending Inc
Golden Shore Medical
Good Faith Registration
Grace Anne Wan, MD | Kaiser Permanente
Gregory Thomas Havlena, MD | Kaiser Permanente
Guo Chinese Medical Center
Gyu S. Chin, MD | Kaiser Permanente
Hak-cheon Kim D.d.s. Inc
Hamid Arjomandi, MD | Kaiser Permanente
Harvard Division (ICF/DD-N)
Health Services Department
Healthworks Medical Group
Heenam Kang, D.d.s., A Sole Proprietor
Heidi Chen Chew, MD | Kaiser Permanente
Hiroshi Kan Katsumi, MD | Kaiser Permanente
Hs Gill Dds Inc
Hugo Victor Hua, MD | Kaiser Permanente
ICM
Industrial Practice Management
Inland Breast and Body
Inland Center Medical Group
Inland Chiropractic
Inland Metro Medical Group
Isil Smith, MD | Kaiser Permanente
James K Jung, DPM
James M. Chui, MD | Kaiser Permanente
Jane Ji-eun Yeo, MD | Kaiser Permanente
How to choose a doctor in Ontario
- Call your insurance to confirm the provider is in network before your first visit.
- Ask about telehealth options and how to reach the office after hours.
- Ask how long it usually takes to get a new-patient appointment.
Check the license: Medical Board of California.
Medical weight loss and GLP-1 care in Ontario: what to ask
- GLP-1 medicines such as semaglutide and tirzepatide are prescription-only. A licensed prescriber should review your health history and any labs.
- Ask whether the medication is an FDA-approved brand or a compounded version, and which pharmacy fills it.
- Ask for the full monthly cost in writing: visits, medication, shipping and follow-up.
- Ask how side effects are monitored and how often you will check in with a clinician or dietitian.
See the medical weight loss guide for providers by state.
Common questions
How many doctors & clinics are listed in Ontario, California?
USA Business Search shows 320 doctors & clinics in Ontario. 288 list a phone number and 286 list a website.
Which ZIP codes do these listings cover?
They include ZIP codes 91761, 91762, 91764.
How do I choose a doctor in Ontario?
Call your insurance to confirm the provider is in network before your first visit. Ask about telehealth options and how to reach the office after hours. Check the license with the Medical Board of California.
How do doctors & clinics in Ontario compare with the rest of California?
Ontario has 0% of the 79,064 doctors & clinics listed in California, which ranks #57 among California cities for this category.
How do I add or fix a listing?
Listings are free. Use Add your business, or the Claim or fix link on any listing.
Do I need a prescription for GLP-1 weight loss in Ontario?
Yes. Semaglutide and tirzepatide are prescription medications, and a licensed provider decides whether they are appropriate for you. Telehealth programs such as Elevation Health (featured) review your intake from home.
More health & medical in Ontario
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