Ranked · 16 of 24 assessed
Ordered by Agency List ScoreAI optimization and SEO for measurable digital growth
Medical website design and digital marketing for healthcare providers and clinics
Performance marketing and AI-driven strategies for measurable brand growth.
Web design, SEO, and PPC for client conversion
Branding and web services for inbound lead capture and search visibility
iOS, Android, and web development paired with SEO and cloud migration
SEO, social media, and content marketing expertise
Brand development and growth with AI-driven insights
Boosts business revenue with SEO and social media marketing.
SEO, PPC, and Web Design for Diverse Industries
Custom web design and ecommerce development across Shopify, Magento, and WordPress
Empowers B2B growth with HubSpot and AI-driven marketing.
Transforms brands with digital marketing and IT solutions
Websites, apps, and branding built for financial, insurance, nonprofit, and government clients
SEO, PPC, and Web Design with No-Contract Results
Also in California · 634 not ranked here
626 have not yet been assessed on the Agency List Score. Alphabetical.About this ranking
What this page ranks
This page ranks 16 of the 24 assessed SEO agencies in California — the ones carrying a published score — out of 650 listed.
The score measures how well an agency documents its own work in public — named clients, quantified outcomes, and whether those outcomes are attributed to the agency rather than described as the client's own results. It does not measure client satisfaction, price, or availability.
Cohorts and awards
Agencies are compared within a cohort — here, SEO in California. A cohort must be large enough to express the band being awarded: at least 8 assessed agencies for a top 25% award, 20 for top 10%, 40 for top 5%, and 300 for top 1%. This one holds 24, so the strongest award available here is top 10%.
The 626 SEO agencies not yet assessed are listed on this page but not ranked.
A further 8 were assessed and no published evidence of their work was found, so no score is shown for them.
Paid placement
Partner agencies can buy a labelled placement block above the ranking on this page. It is always marked as paid and is never mixed into the ranked list.
Placement is paid; it does not affect the ranking, cohort membership, or any agency's score. Ranking position, cohort membership and the score itself are not for sale.
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Categories in California
SEO nearby
Questions
- How many SEO agencies are in California?
- 650 are listed on Agency List in California. 24 of them have been assessed on the Agency List Score as of September 2026, and 16 of those carry a published score.
- Which SEO agency in California is ranked highest?
- Avita Group, with an Agency List Score of 96.1, ranks #1 of 24 assessed agencies in SEO in California.
- Why are 634 SEO agencies listed here but not ranked?
- 626 of the 650 listed have not yet been assessed on the Agency List Score. A further 8 were assessed and no published evidence of their work was found, so no score is shown for them. They each have a profile and are listed below the ranking, alphabetically, rather than being hidden or mixed into it.
- How is the ranking determined?
- By Agency List Score, within the SEO in California cohort of 24 assessed agencies. The score is computed from evidence published on each agency's own website: named clients, quantified outcomes, and whether the outcome is attributed to the agency. Paid placement does not affect it.