Top 10 SEO & AI Search Agencies in the USA (2026)
The top 10 seo & ai search agencies in the USA for 2026, ranked by Growth Partner Confidence Score with cited public evidence for every pick.
Updated July 23, 2026 · Compiled and reviewed by Growth Partner Index Editorial Desk
Organic search used to be a Google problem. Now it's a Google problem plus a ChatGPT problem, a Perplexity problem, an AI Overviews problem, and a Gemini problem. Each with its own quirks about what gets cited and why. The strongest US agencies in this category quietly rebuilt their content and technical workstreams around that shift while the rest of the industry was still arguing about whether it would happen.
We surfaced the highest-scoring US shops from the Growth Partner Index's SEO & AI Search category. Each pick is grounded in public evidence and a Confidence Score that rewards technical depth and demonstrated outcomes over promises. Methodology and freshness weigh especially heavy here, because the AI-search landscape shifts month to month.
The healthy skepticism to bring: any agency promising rankings without talking about site architecture, internal linking, and entity-based content is selling yesterday's playbook. Reporting should cover organic sessions, conversions, and citation share across AI surfaces. Not just keyword ranks.
The shortlist
Ranked by Growth Partner Confidence Score
- 1
Indexable's case studies show named operators and disclosed traffic-to-pipeline outcomes for enterprise SaaS clients.
Full profileVisit website$50k–$250k/mo
- 2
Croud is an independent global media, creative, and data agency founded in 2011 with 600+ in-house experts, offices in London, New York, and Dubai, and named case studies including a 55% enquiry increase for IWG and 35% ROAS lift for MPB.
Full profileVisit website$50k–$250k/mo
- 3
Thrive Internet Marketing Agency is a 160+ person full-service digital marketing agency headquartered in Arlington, TX, founded in 2005, with named case studies including a 750-patient orthopedic group and a 40% loan-volume lift for Brazos Higher Education.
Full profileVisit website$10k–$50k/mo
- 4
Answerlift publishes a tracking methodology for AI answer surfaces and ships citation-earning content briefs.
Full profileVisit website$10k–$50k/mo
- 5
Bluethings is a B2B SEO agency focused on revenue growth, offering services like relationship link building, content writing, and technical SEO for SaaS and B2B companies.
Full profileVisit website$10k–$50k/mo
- 6
Major Tom is a 65-person full-service marketing agency founded in 2000, with teams in Vancouver, Toronto, and New York running integrated paid media, SEO/AEO, analytics, and web programs.
Full profileVisit website$50k–$250k/mo
- 7
Seer Interactive is a B-Corp certified digital marketing agency specializing in SEO, paid media, analytics, and Generative Engine Optimization (GEO) for large enterprises and challenger brands.
Full profileVisit website$250k–$1M/mo
- 8
Fielddraft publishes content briefs designed to earn AI overview citations alongside ranking lift.
Full profileVisit website$10k–$50k/mo
- 9
Brave Bison is a London-headquartered media, marketing, and technology group with offices across four continents, running paid and organic performance for brands including New Balance, ASUS, Currys, and ghd.
Full profileVisit website$50k–$250k/mo
- 10
Coalition Technologies is a Los Angeles-headquartered digital agency with a 250+ member team, offering SEO, PPC, web design, development, email, and social, and publishing 800+ client case studies.
Full profileVisit website$10k–$50k/mo
How we picked
Picks are agencies tagged to the seo-ai-search category, sorted by Confidence Score. Methodology and freshness weigh heavily as the AI-search landscape changes monthly.
Read the full Growth Partner Confidence Score methodology, or submit a correction if something here is wrong.
Frequently asked questions
- Who is the #1 seo & ai search agency in the USA in 2026?
- Indexable ranks #1 among seo & ai search agencies in the USA for 2026 with a Growth Partner Confidence Score of 78/100. Indexable is based in San Francisco, CA and is best suited to b2b saas teams rebuilding organic strategy around ai search shifts. Croud (75/100) ranks second.
- How were these agencies selected?
- Every agency on this list is scored against the same seven-pillar Growth Partner Confidence Score: proof of outcomes, category fit, creative-media integration, reputation, operating maturity, buyer fit, and freshness. Scores are built only from public, citable evidence such as case studies, press, and interviews. Placement cannot be purchased, and sponsored listings are labelled and never re-ranked.
- What should I look for when choosing a seo & ai search agency?
- Ask how they track citation share in ChatGPT, Perplexity, and AI Overviews, not just keyword ranks. Site architecture, internal linking, and entity coverage should be in the first 90-day plan. Beyond that, confirm the budget band matches yours and that the senior operator named in the pitch is the person who will actually run the account.
- How much do seo & ai search agencies charge?
- Retainers commonly run $5k–$25k/mo for mid-market programs, with enterprise technical and content programs above $30k/mo. Project-based technical audits run $10k–$40k. Every profile in this index lists the agency's disclosed budget band so you can filter before the first call.
- What is GEO / AEO and how is it different from SEO?
- Generative Engine Optimization (GEO) and Answer Engine Optimization (AEO) optimize content so LLM-powered surfaces. ChatGPT, Perplexity, AI Overviews, Gemini. Actually cite it. The work overlaps with technical SEO but leans harder on citation-ready structure, entity coverage, and mention tracking across AI tools.
- How long until SEO work actually moves traffic?
- Technical fixes can show up in traffic within a few weeks. Content and authority work usually takes three to nine months to compound. Anyone promising material ranking lifts inside sixty days is either misreading the timeline or selling something else entirely.
- Can the same agency handle SEO and AI search?
- Increasingly, yes. The disciplines share most of their plumbing: entity coverage, structured data, content quality. The question to ask is whether they track LLM citation explicitly, not whether they say they do.