List of Doctors in Ontario
Ontario, California, has 313 doctors in this dataset, last verified September 6, 2026. Among the 250 California cities we track, it ranks 68th, between Clovis (318) and Highland (309). Local listings make up 0.5% of all doctors in California.
104 doctors in Ontario list both a phone number and an email address, the best starting point for multi-channel outreach. At 33.2%, email coverage runs well above the California average of 19.2%, while 95.8% of listings include a phone number.
62.9% of doctors in Ontario have a website (in line with 59.8% across California), which leaves 116 local prospects for web design and Google Business Profile services. 35 of their websites list a contact page URL.
58% of the 192 rated doctors in Ontario hold a 5-star average, above the California figure of 52%. The 22 rated 1 to 2 stars are the obvious first calls for a reputation management pitch.
Social Media Reach
138
127
113
68
YouTube
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Doctors List in Ontario
Browse a random sample of 15 records — see the exact fields and data quality before you download.
| LOGO | Business Name | Address | City | State | Country | Phone | Website | Reviews | Rating | FB | IG | LI | YT | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dr. David Lozano, MD | Address | Ontario | California | United States | Email | Phone | 42 | 1.8 | — | — | — | — | |||
 | Ontario Medical Associates: Pitts Jeffrey C MD | Address | Ontario | Oregon | United States | Email | Phone | 10 | 5 | — | — | — | — | ||
Dr. Saira Syed, DO | Address | Ontario | Oregon | United States | Email | Phone | — | 0 | 0 | — | — | — | — | ||
Connor Gerard P MD | Address | Ontario | Oregon | United States | Email | Phone | 0 | 0 | |||||||
MATERNITY CARE CLINIC | Address | Ontario | Oregon | United States | Email | Phone | — | 0 | 0 | — | — | — | — | ||
Euclid Plaza Medical Clinic | Address | Ontario | California | United States | Email | Phone | — | 0 | 0 | — | — | — | — | ||
Dr. Eduardo M. Cairo, DDS | Address | Ontario | California | United States | Email | Phone | — | 0 | 0 | — | — | — | — | ||
Dr. James H. Mooney, MD | Address | Ontario | Ohio | United States | Email | Phone | 0 | 0 | — | — | — | — | |||
 | DOT CDL Physical Exam Ontario | Address | Ontario | California | United States | Email | Phone | 78 | 4.8 | — | — | — | — | ||
 | Kathryn Collins, DO | Address | Ontario | Ohio | United States | Email | Phone | 31 | 4.9 | — | |||||
Dr. Carlos Molina Arriola | Address | Ontario | Ohio | United States | Email | Phone | — | 0 | 0 | — | — | — | — | ||
Dr. Eric C. Rysenga, MD | Address | Ontario | Oregon | United States | Email | Phone | — | 0 | 0 | — | — | — | — | ||
 | OMC (Oregon Man Clinics) | Address | Ontario | Oregon | United States | Email | Phone | 19 | 4.8 | — | — | ||||
Dr. Jose de la Llana MD | Address | Ontario | California | United States | Email | Phone | — | 12 | 3.4 | — | — | — | — | ||
Dr. Harold K. Thompson, MD | Address | Ontario | Oregon | United States | Email | Phone | 0 | 0 |
This is a randomized preview — the full database contains 313 records with complete field coverage.
Get the full Doctors database
313 verified records — emails, phones, social profiles and more. One-time payment, instant download.
Top business categories in Ontario
Most popular business categories across Ontario
Category | Doctors |
|---|---|
What You Can Do with the List of Doctors in Ontario
This list is built for teams that sell to doctors: medical supply distributors, practice software vendors, billing services and healthcare staffing agencies. It covers 313 doctors in Ontario, with the fields to call, email, segment and map them.
Who Sells to Doctors in Ontario, California
Each of these buyers can work the 313 businesses in this list as a pipeline for a different product:
- Medical and dental supply distributors: Open accounts with the 313 doctors in Ontario for consumables, instruments and equipment.
- Practice management and EHR software: Pitch scheduling, patient records and billing systems to independent practices.
- Medical billing and credentialing services: Offer to take claims, coding and payer enrollment off the front desk.
- Healthcare staffing agencies: Place nurses, medical assistants and front-office staff.
Phone, Facebook and Email Outreach in Ontario, California
Start with the 104 records that list both a phone number and an email address, then widen out channel by channel:
- Cold calling (300): 95.8% of records include a phone number for call campaigns, appointment setting and follow-ups.
- Facebook messages (138): 44.1% have a Facebook page, a further channel when calls and emails go unanswered.
- Email sequences (104): 33.2% of records include an email address, enough to run a dedicated cold email campaign alongside calls.
- CRM import: CSV and Excel files load into HubSpot, Salesforce, Zoho or Pipedrive, with city, state and postal code columns for assigning leads to reps.
Prospect Segments for Agencies in Ontario, California
Filter the website, rating and social columns to pull the doctors that fit a specific service before you pitch:
- No website listed (116): 37% of doctors in Ontario have no website on record, a direct prospect list for web designers and local SEO agencies.
- Rated 1 to 2 stars (22): businesses with poor Google ratings, prospects for reputation management and review generation services.
- No Facebook page (175): 56% have no Facebook page on record, an opening for social media management agencies.
Local Coverage Plan for Ontario
With 313 doctors in one city, local teams can work the list in person as well as by phone:
- Route planning: records include latitude and longitude, so field reps can map all 313 doctors in Ontario and plan visit days by neighborhood.
- Postal code patches: split Ontario by postal code to divide accounts between reps or focus on specific parts of town.
- Next markets: the 249 other California cities we track are the next step once Ontario accounts are covered.
Data Coverage for Doctors in Ontario
313 records · verified September 6, 2026
- Phone numbers
- 300
- Email addresses
- 104
- Phone and email
- 104
- Websites
- 197
Google ratings· 192 rated (61%)
58% hold 5 stars
- 1-star rated
- 8
- 4.2% of rated
- 2-star rated
- 14
- 7.3% of rated
- 3-star rated
- 36
- 18.8% of rated
- 4-star rated
- 23
- 12% of rated
- 5-star rated
- 111
- 57.8% of rated
Social profiles:
- Facebook:138· 44.1%
- Instagram:127· 40.6%
- LinkedIn:113· 36.1%
- X (Twitter):87· 27.8%
- YouTube:68· 21.7%
Doctors in Ontario are a mixed-channel, Facebook-heavy market: 95.8% list a phone number and 33.2% publish an email. Among 192 rated doctors, 58% hold 5 stars, a mostly positive spread.
Related Doctors by Location
Browse datasets for Doctors across nearby locations
Frequently asked questions about Doctors in Ontario, California
Everything you need to know about our doctors database for Ontario, California: data quality, coverage, freshness, pricing, and formats. Last updated September 6, 2026.
How many Doctors are there in Ontario, California?
There are 313 doctors in Ontario, California in our verified database, as of September 6, 2026.
This covers independent operators, regional chains, and enterprise-scale businesses, giving you the complete Ontario market for sales prospecting and territory planning.
How up to date is the Doctors data for Ontario, California?
This dataset was last updated in September 6, 2026.
Business contact data decays at roughly 2–3% per month as businesses close, move, or change details, so we re-verify our most-purchased datasets on a rolling basis.
Every file is also run through email verification before delivery, and past buyers are offered discounted refreshed versions as updates ship.
What fields are included in the Doctors database for Ontario, California?
Each record can include: business name, full address, phone number, email address, website URL, social profiles (LinkedIn, Facebook, Instagram, YouTube, X), review ratings, and category details, plus contact-page URLs where available.
Field coverage varies by record; the counts below and the free sample show you exactly what to expect before buying.
Where can I buy verified market intelligence data for Doctors businesses in Ontario, California?
InfiniteLeadsHub provides verified market intelligence datasets for doctors businesses in Ontario, California as a one-time purchase with no subscription.
Ideal for market research, sales planning, and business development.
How much does the Doctors database for Ontario, California cost?
The complete doctors leads database for Ontario, California costs $10 as a one-time payment.
You get instant access to all 313 records with no recurring fees, no per-record charges, and no seat limits.
It is a cost-effective alternative to subscription platforms that charge monthly for the same public business data.
Is this a cheaper alternative to subscription lead databases like ZoomInfo or Apollo?
Yes. For teams that need doctors contacts in Ontario, California specifically, a one-time $10 file is usually far cheaper than subscription platforms, which typically charge thousands of dollars per year with contracts and per-seat pricing.
Subscriptions make sense for large sales teams needing continuous multi-industry access; a one-time targeted list makes sense when you know exactly which niche and geography you're selling into.
Can I preview a sample of the Doctors data before buying?
Yes. A free sample dataset is available so you can evaluate data quality, field coverage, and format before purchasing.
The sample is a representative slice of the full Ontario, California doctors database, including contact fields, social profiles, and ratings data.
How do I download the Doctors list, and what file formats are available?
You get instant access after purchase. Files are delivered in CSV and Excel (XLSX) formats.
CSV and Excel import directly into CRMs like Salesforce, HubSpot, and Zoho and into any email platform.
How many Doctors in Ontario, California have phone numbers?
300 doctors in Ontario, California (96% of the database) include a phone number.
That makes the dataset effective for cold calling, telemarketing, and appointment setting campaigns.
How many Doctors in Ontario, California have email addresses?
104 doctors in Ontario, California (33%) include an email address.
Email remains one of the highest-ROI B2B outreach channels, making this subset ideal for cold email sequences, product announcements, and drip campaigns.
How many Doctors in Ontario, California have both a phone number and an email address?
104 doctors in Ontario, California have both a phone number and an email address.
Dual-contact records enable multi-channel outreach: combining calls with email follow-ups measurably improves response rates.
How many Doctors in Ontario, California are active on social media?
Social profile coverage for doctors in Ontario, California: 113 on LinkedIn, 138 on Facebook, 127 on Instagram, 68 on YouTube, 87 on X (Twitter).
Social presence signals digitally engaged businesses, which is useful for agencies pitching social media services, ad platforms building audiences, and vendors targeting digitally mature prospects.
How many Doctors in Ontario, California have a website?
197 doctors in Ontario, California (63%) have an active business website.
That is an indicator of digital maturity, and an ideal segment for SEO agencies, hosting providers, and SaaS platforms.
How many Doctors in Ontario, California do not have a website?
116 doctors in Ontario, California operate without a business website.
These are high-intent, overlooked prospects for web design agencies, local SEO providers, and Google Business optimization services.
What are the review ratings of Doctors in Ontario, California?
Rating breakdown for doctors in Ontario, California: 111 with a 5-star rating, 23 with a 4-star rating, 36 with a 3-star rating, 14 with a 2-star rating, 8 with a 1-star rating.
Top-rated businesses suit premium services and partnership proposals; lower-rated businesses are receptive prospects for reputation management, review tools, and operational software.
Can I get Doctors data for all of California or the entire US?
Yes. Beyond Ontario, we offer the complete Doctors database for California and a national all-50-states version.
If you buy the Ontario list first, contact us and we'll credit your purchase toward the state or national upgrade.
Is the Doctors contact data in Ontario, California legal to use for B2B outreach?
Yes. All data is sourced exclusively from publicly available information: Google Business listings, company websites, social media profiles, and public business directories.
This is business contact information, not personal consumer data, making it appropriate for B2B prospecting.
We recommend following applicable regulations such as CAN-SPAM (US), CASL (Canada), and GDPR (EU-targeted campaigns) so your outreach remains fully compliant.