Doctors and health care providers in Thornton, CO
2,234 individual NPPES records list a practice address in Thornton, 17th of 193 Colorado cities. The largest group is mental health counselor: 244, 11% of the city's records, against 6% across Colorado. Page 30 of 45.
The 8 largest groups in Thornton
Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.
Thornton in Colorado
- Rank in Colorado17th of 193 cities by records
- Share of the state1.5% of Colorado's records
- Specialties present25 or more taxonomy codes
- Top three groups24.4% of all records
- Mental Health Counselor rank10th of the 10 Colorado cities with the most
Compared with Colorado as a whole, Thornton has 4.7× the state's share of interpreter records and 0.22× its share of behavior technician records.
Providers in Thornton, alphabetically
- Rosemary O'DonnellOccupational Therapist1831975580
- Barbara O'DwyerMental Health Counselor1922987726
- Jessica O'Dwyer, RDRegistered Dietitian1861289183
- Charles O'Neill, BAMental Health Counselor1467584474
- Carol Oakleaf, PAPhysician Assistant1124340583
- Reegan Ochoa, EMTEmergency Medical Services (Emergency Medicine) Physician1235084781
- Steve OchoaMental Health Counselor1487907655
- Genevieve Ochs, MDFamily Medicine Physician1457763237
- Danya OdomProfessional Counselor1275028045
- Christian Oggel, PAPhysician Assistant1730635418
- John Oh, LPCCMental Health Counselor1043078363
- Karla OjedaMental Health Counselor1063531549
- Carlos Ojeda Cedeno, M.A.Counselor1457759862
- Laurel Okasaki, MSW, LCSWClinical Social Worker1588053847
- Morry Olenick, MDPlastic Surgery Physician1265596308
- Jonathan Olivier, DDSGeneral Practice Dentistry1124248653
- Courtney OlmscheidSpeech-Language Pathologist1114703378
- Sydney OlmstedSpeech-Language Pathologist1649193764
- Nancy Olsen, LPCProfessional Counselor1962560573
- Nicholas Olsen, D.O.Physical Medicine & Rehabilitation Physician1063472785
- Dennis Olson, M.D.Specialist1841397254
- Liana OlveraMassage Therapist1982200929
- Joseph Oria, MSW, LCSW, LACClinical Social Worker1467855718
- Adam Orin, MA, LPCMental Health Counselor1952898900
- Shawna OrozcoCounselor1366817009
- Shannon Ortiz, PHARMDPharmacist1932531399
- Sara Ortiz Becerra, LICSWClinical Social Worker1346479417
- Linda Osterlund, PH.D., LMFTMarriage & Family Therapist1427820141
- Ryan Otten, M.D.Occupational Medicine Physician1649463407
- Justin OttesonAddiction (Substance Use Disorder) Counselor1538674502
- Christina Ottomeyer, DOOrthopaedic Surgery Physician1073931705
- Breeann OverbergDoula1053140947
- Elizabeth Overturf, OTR/LOccupational Therapist1114754637
- Cathleen OwensProfessional Counselor1336371632
- Rachle OxfordCounselor1962947903
- Nicole PaavolaMental Health Counselor1265898654
- Cyndia Pace, MA, LPCMental Health Counselor1326388216
- Katherine PaceMental Health Counselor1689227647
- Breeanna PachecoPharmacist1134840804
- Jose Pacheco, M.D.Cardiovascular Disease Physician1417945759
- Kimberley PachecoBehavior Technician1356001572
- Malinda Paddock, LCSWAddiction (Substance Use Disorder) Counselor1831531284
- Ashley PadillaCounselor1942730338
- Paul Padilla, CASAddiction (Substance Use Disorder) Counselor1801561030
- Duncan Page, LPCProfessional Counselor1427363050
- Martina Paiz, NPCommunity Health Nurse Practitioner1225227234
- Kristy Palacios, LPCCounselor1073967485
- Jennifer Palazzolo, RPHPharmacist1326322124
- Elizabeth PalizziParamedic1134080385
- Emilio PalleteMental Health Counselor1508135237
The largest Colorado cities
- Denver25,068
- Colorado Springs19,771
- Aurora17,400
- Fort Collins6,928
- Boulder5,635
How to read this directory
Thornton, Colorado appears in the CMS National Plan and Provider Enumeration System with 2,234 registered healthcare providers spanning 25 or more distinct NUCC-taxonomy specialties. This count includes every individual clinician who has applied for an NPI and listed a practice address in Thornton - physicians, dentists, nurse practitioners, physician assistants, chiropractors, physical therapists, optometrists, psychologists, podiatrists, and every other credentialed provider type CMS tracks. It does not measure hospital beds, urgent-care capacity, or whether a given clinic is accepting new patients; it measures the pool of professionals with current NPI enrollment and a Thornton practice location on file. Every figure is drawn from the federal National Provider Identifier Registry (CMS NPPES) - more than 7 million providers, maintained since May 2007, with 2024 Medicare Part D data, and, according to CMS, can be searched, compared, and traced in our methodology.
The provider mix in Thornton is weighted toward Mental Health Counselor (244 clinicians, followed by Counselor with 162 and Clinical Social Worker with 139). That distribution reflects how NPPES records specialty: providers self-select a primary taxonomy code, so a family physician who also practices geriatrics will show up under whichever NUCC code they registered first. Relative to Colorado's population, Thornton reports roughly 38 providers per 100,000 residents using the state-level denominator, which is a rough proxy rather than a precise access-to-care measurement; the true catchment area of any {cityName} clinician extends beyond the municipal boundary.
Of Colorado's most common specialties, Student in an Organized Health Care Education/Training Program is the most prominent one with no provider currently listing a Thornton practice address, a coverage gap Thornton patients typically fill by traveling to a larger nearby hub.
For Thornton patients, this directory is most useful as a starting shortlist. Important: PlainDoctor is a directory of publicly available CMS government data, not a review site, a ranking, or medical advice. NPPES data is self-reported and refreshed monthly; call the practice directly to confirm the provider is still there, accepts your insurance, and is taking new patients.
For informational purposes only; this directory is not medical advice and not a substitute for checking a license. See also: how to find a doctor and how to verify one.
Common questions
How many doctors are in Thornton, CO?
There are 2,234 registered healthcare providers in Thornton, CO, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.
What are the most common medical specialties in Thornton?
The most common specialties in Thornton are Mental Health Counselor, Counselor, Clinical Social Worker, Professional Counselor, Speech-Language Pathologist. Mental Health Counselor has the most providers with 244.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov). Records are self-reported registrations, not licenses.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.