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Advertising agencies in Los Angeles, CA

437 advertising agencies listed in Los Angeles, California. 424 with a phone number and 399 with a website.

Los Angeles accounts for 15% of the advertising agencies listed in California and ranks #1 among California cities for advertising agencies.

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Quick answer

Los Angeles, CA has 437 advertising agencies listed on USA Business Search. 424 list a phone number and 399 list a website. The most listings are in ZIP codes 90028, 90017, 90066.

Updated October 2026
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How to choose an advertising agency in Los Angeles

  • Ask how they track ads to real calls, forms and sales, not just clicks.
  • Make sure your ad accounts are in your name, not the agency's.
  • Ask what the management fee is and what the ad spend is, separately.

How Los Angeles businesses get found in Google and AI answers

  • Claim and complete your Google Business Profile, then keep hours, photos and services current.
  • Use the same business name, address and phone everywhere you are listed, including directories like this one.
  • Publish pages that answer the questions customers actually ask, so ChatGPT, Gemini, Perplexity and Google AI Overviews can cite you.
  • Add LocalBusiness schema, clear pricing and service pages so AI assistants and booking agents can read your details.

Learn more: SEO vs. AI search optimization · Get found on Google Maps and in AI answers · How to pick an SEO company

Common questions

How many advertising agencies are listed in Los Angeles, California?

USA Business Search shows 437 advertising agencies in Los Angeles. 424 list a phone number and 399 list a website.

Which ZIP codes do these listings cover?

They include ZIP codes 90028, 90017, 90066, 90025, 90036, 90064, 90048, 90038.

How do I choose an advertising agency in Los Angeles?

Ask how they track ads to real calls, forms and sales, not just clicks. Make sure your ad accounts are in your name, not the agency's.

How do advertising agencies in Los Angeles compare with the rest of California?

Los Angeles has 15% of the 3,003 advertising agencies listed in California, which ranks #1 among California cities for this category.

How do I add or fix a listing?

Listings are free. Use Add your business, or the Claim or fix link on any listing.

What should I ask a Los Angeles marketing agency before I hire them?

Ask who will actually do the work, how they track calls and forms, and what happens to your accounts if you leave. Eye To Ad Media offers a free review of how your business shows up in Google and AI answers.

What is AI search optimization (AIO or GEO)?

It is the work of making your business easy for AI assistants like ChatGPT, Gemini and Google AI Overviews to understand, trust and recommend: consistent listings, structured data, and pages that answer real customer questions. Read SEO vs. AI search optimization.

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