366 licensed clinicians list a practice address in Ontario in the federal NPI Registry. Choose a provider type to see everyone, or start with the list below.
366clinicians
337therapists
5psychiatrists
3ZIP codes
NPI records show who a clinician is, where they practice and their license type. They don't show insurance, openings or telehealth, so call to confirm those.
For talk therapy, any licensed therapist can help: psychologist, counselor, clinical social worker or marriage and family therapist. For medication, see a psychiatrist or a psychiatric nurse practitioner. For testing (ADHD, learning, memory), see a psychologist or neuropsychologist. How the roles differ · Which provider do I need?
Questions
How many mental health providers are in Ontario, CA?
The NPI Registry lists 366 licensed behavioral health clinicians with a practice address in Ontario, including 337 therapists and 5 psychiatrists. Some see patients only inside a hospital or clinic, and a few may have retired without closing their NPI.
No. Every listing comes from public NPI data. Nobody pays to appear, and lists are alphabetical by last name.
Listings come from the CMS National Plan and Provider Enumeration System (NPI Registry), October 2026 copy. A listing is not a recommendation. Nobody pays to appear here or to rank higher; lists are alphabetical by last name. This page is general information, not medical advice. How we verify