AGENCY LIST

Advertising Agencies in California

189 advertising agencies are listed in California, United States. 3 have been assessed on the Agency List Score as of September 2026; the highest-ranked is Simplicity Media at 96.0.

Ranked · 3 assessed

Ordered by Agency List Score
#1 of 3 assessed
Simplicity Media
96
Verified

Media planning across TV, CTV, radio, podcast, and programmatic for growth-stage brands

Ad Operations and TraffickingAds ManagementAnalytics & Reporting
View profile
#2 of 3 assessed
WHM Creative
92
Verified

B2B marketing with brand strategy and digital execution

Media Planning and Buying
View profile
#3 of 3 assessed
Jives Media
73
Verified

Digital marketing with SEO, web design, and paid advertising

Ad Operations and TraffickingAudio and Podcast AdsBrand Campaigns
View profile

Also in California · 186 not yet assessed

Listed agencies queued for assessment. Alphabetical.
180 GlobalView profile →510techView profile →562CREATIVESView profile →AcentoView profile →AdorngroupView profile →AdzediaView profile →Al Shultz AdvertisingView profile →AnomalyView profile →Apollo InteractiveView profile →Ars X MachinaView profile →AV SquadView profile →Avidon Marketing GroupView profile →Bag Your MarketingView profile →Barrett HofherrView profile →Bautista Direct MarketingView profile →BDIView profile →BeforeTheMovieView profile →Big Wave MediaView profile →Bloom AdsView profile →BONDView profile →BrainShineView profile →Brand HouseView profile →Bravo DesignView profile →Brook AdvertisingView profile →
85 more listed here are not shown on this page.

About this ranking

What this page ranks

This page ranks the 3 advertising agencies in California, United States that have been assessed on the Agency List Score, out of 189 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, Advertising in California, United States. 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 3, so no award can be issued here.

The 186 advertising agencies not yet assessed are listed on this page but not ranked.

Read the full methodology

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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Questions

How many advertising agencies are in California, United States?
189 are listed on Agency List in California, United States. 3 of them have been assessed on the Agency List Score as of September 2026.
Which advertising agency in California, United States is ranked highest?
Simplicity Media, with an Agency List Score of 96.0, ranks #1 of 3 assessed agencies in Advertising in California, United States.
Why are 186 advertising agencies listed here but not ranked?
186 of the 189 listed have not yet been assessed on the Agency List Score. 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 Advertising in California, United States cohort of 3 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.