Urgent care & hospitals in Ontario, CA
29 urgent care & hospitals listed in Ontario, California. 25 with a phone number and 26 with a website.
Ontario accounts for 0% of the urgent care & hospitals listed in California and ranks #44 among California cities for urgent care & hospitals.
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Quick answer
Ontario, CA has 29 urgent care & hospitals listed on USA Business Search. 25 list a phone number and 26 list a website. The most listings are in ZIP codes 91761, 91764, 91762.
Updated October 2026Carefirst Medical Group Inc
Up Clinics
Kindred Hospital Ontario
Hoon Kim, MD | Kaiser Permanente
Andrew Chen Cha, DO | Kaiser Permanente
Bionime Usa Corporation
Centro Medico Familiar
ClearChem Diagnostics, Inc
Continental Air Ambulance, Inc
Document Storage Corp
Ethan Chen MD | Kaiser Permanente
Harris Healthcare Ontario
Henry Cho MD | Kaiser Permanente
Kaiser Optometry
Kaiser Permanente Health Care
Kaiser Urgent Care
MDG Ruiz & Family
Michelle Eunbi Choi, DO | Kaiser Permanente
Mills Surgery Center
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Molina Medical Centers
MPM Products Inc
Ontario Medical Center
Philips Oral Healthcare
Primemax Medical Industries, Inc.
Signature Mri, Inc
U.s. Healthworks Medical Group
Ultrasound Institute Medical Group Ontario
Watson Profiling Inc.
How to choose a clinic in Ontario
- Call your insurance to confirm the provider is in network before the first visit.
- Ask how new-patient appointments, telehealth and after-hours questions work.
- Bring a list of current medications to the first appointment.
Check the license: Medical Board of California.
Common questions
How many urgent care & hospitals are listed in Ontario, California?
USA Business Search shows 29 urgent care & hospitals in Ontario. 25 list a phone number and 26 list a website.
Which ZIP codes do these listings cover?
They include ZIP codes 91761, 91764, 91762.
How do I choose a clinic in Ontario?
Call your insurance to confirm the provider is in network before the first visit. Ask how new-patient appointments, telehealth and after-hours questions work. Check the license with the Medical Board of California.
How do urgent care & hospitals in Ontario compare with the rest of California?
Ontario has 0% of the 5,879 urgent care & hospitals listed in California, which ranks #44 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.
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