List of Oncologists in California
California has 3,783 oncologists in this dataset, last verified September 6, 2026. That makes it the largest market for oncologists in the United States, with 10% of the national total, ahead of New York (2,564).
Among cities, San Francisco leads by a wide margin with 312, 70% more than Los Angeles (183), followed by Palo Alto (159). Together the top three hold only 17% of all oncologists in California, so the market reaches well beyond its biggest cities.
Email reach in California runs above the national rate: 1,227 oncologists (32.4%) include an email address, against 28.3% across the United States. 3,701 (97.8%) list a phone number, and 1,218 carry both.
75.7% of oncologists in California have a website, in line with the national average of 79.4%. Only 918 lack a site, so pitch redesigns and SEO rather than first-time builds.
Among the 1,942 rated oncologists in California, 66% hold a 5-star average, in line with the national figure of 71%. 156 are rated 1 to 2 stars (8% of rated businesses, well above the national 5.8%), a natural shortlist for reputation management and review software.
Social Media Reach
1,264
1,112
993
1,037
YouTube
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Oncologists List in California
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| LOGO | Business Name | Address | City | State | Country | Phone | Website | Reviews | Rating | FB | IG | LI | YT | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | San Francisco CyberKnife | Address | San Francisco | California | United States | Email | Phone | 0 | 0 | — | — | — | — | ||
 | Paracelsus Natural Family Health Center | Address | Redlands | California | United States | Email | Phone | 5 | 5 | — | — | — | — | ||
Dr. Bradley J. Tamler, MD | Address | Monterey | California | United States | Email | Phone | 4 | 4 | — | — | — | — | |||
David Masiello, M.D. | Address | Rancho Mirage | California | United States | Email | Phone | — | 3 | 3.7 | — | — | — | — | ||
 | Moores Cancer Center at UC San Diego Health | Address | San Diego | California | United States | Email | Phone | 137 | 3.9 | — | — | — | — | ||
 | Bone Marrow Failure Disorders Program at Stanford Children's Health | Address | Palo Alto | California | United States | Email | Phone | 0 | 0 | ||||||
 | Tanuja A. Bhandari, M.D. | Radiation Oncologist | Address | Irvine | California | United States | Email | Phone | 0 | 0 | — | — | — | — | ||
California Hematology Oncology Medical Group | Address | Los Angeles | California | United States | Email | Phone | — | 0 | 0 | — | — | — | — | ||
O'Brien Maureen M MD | Address | Palo Alto | California | United States | Email | Phone | — | 0 | 0 | — | — | — | — | ||
Kang Helen MD | Address | Los Angeles | California | United States | Email | Phone | — | 1 | 5 | — | — | — | — | ||
 | Uma H Gowda, M.D. | Address | Roseville | California | United States | Email | Phone | 39 | 4.9 | — | — | — | — | ||
 | M. Babak Rahimi, MD | Address | Long Beach | California | United States | Email | Phone | 0 | 0 | — | — | — | — | ||
 | Terence M. Williams, M.D., Ph.D. | Radiation Oncologist | Address | Duarte | California | United States | Email | Phone | 0 | 0 | — | — | — | — | ||
Henry Yampolsky, MD | Address | Beverly Hills | California | United States | Email | Phone | — | 6 | 5 | — | — | — | — | ||
 | Stanford Lymphoma Program | Address | Palo Alto | California | United States | Email | Phone | 7 | 5 | — | — |
This is a randomized preview — the full database contains 3,783 records with complete field coverage.
Get the full Oncologists database
3,783 verified records — emails, phones, social profiles and more. One-time payment, instant download.
Distribution by Location
Number of Oncologists across different territories
What You Can Do with the List of Oncologists in California
This list is built for teams that sell to oncologists: medical supply distributors, practice software vendors, billing services and healthcare staffing agencies. It covers 3,783 oncologists in California, with the fields to call, email, segment and map them.
Who Sells to Oncologists in California
Each of these buyers can work the 3,783 businesses in this list as a pipeline for a different product:
- Medical and dental supply distributors: Open accounts with the 3,783 oncologists in California 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 California
Start with the 1,218 records that list both a phone number and an email address, then widen out channel by channel:
- Cold calling (3,701): 97.8% of records include a phone number for call campaigns, appointment setting and follow-ups.
- Facebook messages (1,264): 33.4% have a Facebook page, a further channel when calls and emails go unanswered.
- Email sequences (1,227): 32.4% 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 California
Filter the website, rating and social columns to pull the oncologists that fit a specific service before you pitch:
- No website listed (918): 24% of oncologists in California have no website on record, a direct prospect list for web designers and local SEO agencies.
- Rated 1 to 2 stars (156): businesses with poor Google ratings, prospects for reputation management and review generation services.
- No Facebook page (2,519): 67% have no Facebook page on record, an opening for social media management agencies.
Prioritize Cities Across California
The 3,783 oncologists in California are spread across 8 cities we track and many smaller towns, so rank areas before sending reps out:
- Top city markets: San Francisco, Los Angeles, Palo Alto, Sacramento and San Diego hold 24% of records in California, the biggest clusters for in-person visits.
- Beyond the big cities: 2,510 records (66%) sit outside the 8 cities with their own list, reachable by phone and email without travel.
- Postal code patches: records include postal codes, so each rep can get a compact patch with no overlapping accounts.
- Route planning: records include latitude and longitude, so you can map accounts and plan visit days around clusters.
Data Coverage for Oncologists in California
3,783 records · verified September 6, 2026
- Phone numbers
- 3,701
- Email addresses
- 1,227
- Phone and email
- 1,218
- Websites
- 2,865
Google ratings· 1,942 rated (51%)
66% hold 5 stars
- 1-star rated
- 81
- 4.2% of rated
- 2-star rated
- 75
- 3.9% of rated
- 3-star rated
- 267
- 13.7% of rated
- 4-star rated
- 233
- 12% of rated
- 5-star rated
- 1,286
- 66.2% of rated
Social profiles:
- Facebook:1,264· 33.4%
- Instagram:1,112· 29.4%
- X (Twitter):1,057· 27.9%
- YouTube:1,037· 27.4%
- LinkedIn:993· 26.2%
Oncologists in California are a mixed-channel, Facebook-heavy market: 97.8% list a phone number and 32.4% publish an email. Among 1,942 rated oncologists, 66% hold 5 stars, a mostly positive spread.
Related Oncologists by Location
Browse datasets for Oncologists across nearby locations
Frequently asked questions about Oncologists in California
Everything you need to know about our oncologists database for California: data quality, coverage, freshness, pricing, and formats. Last updated September 6, 2026.
How many Oncologists are there in California?
There are 3,783 oncologists in California in our verified database, as of September 6, 2026.
This covers independent operators, regional chains, and enterprise-scale businesses, across every city in California, for sales prospecting, competitive research, and territory planning.
How up to date is the Oncologists data for 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 Oncologists database for 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 Oncologists businesses in California?
InfiniteLeadsHub provides verified market intelligence datasets for oncologists businesses in California as a one-time purchase with no subscription.
Ideal for market research, sales planning, and business development.
How much does the Oncologists database for California cost?
The complete oncologists leads database for California costs $36 as a one-time payment.
You get instant access to all 3,783 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 oncologists contacts in California specifically, a one-time $36 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 Oncologists 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 California oncologists database, including contact fields, social profiles, and ratings data.
How do I download the Oncologists 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 Oncologists in California have phone numbers?
3,701 oncologists in California (98% of the database) include a phone number.
That makes the dataset effective for cold calling, telemarketing, and appointment setting campaigns.
How many Oncologists in California have email addresses?
1,227 oncologists in California (32%) 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 Oncologists in California have both a phone number and an email address?
1,218 oncologists in 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 Oncologists in California are active on social media?
Social profile coverage for oncologists in California: 993 on LinkedIn, 1,264 on Facebook, 1,112 on Instagram, 1,037 on YouTube, 1,057 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 Oncologists in California have a website?
2,865 oncologists in California (76%) 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 Oncologists in California do not have a website?
918 oncologists in 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 Oncologists in California?
Rating breakdown for oncologists in California: 1,286 with a 5-star rating, 233 with a 4-star rating, 267 with a 3-star rating, 75 with a 2-star rating, 81 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 Oncologists data for other states or the entire US?
Yes. The national Oncologists database covers all 50 US states, and individual state and major-city lists are also available.
If you buy California first, contact us and we'll credit your purchase toward the national upgrade.
Most multi-state buyers save money going national.
Is the Oncologists contact data in 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.