The Best SEO and AI Search Agencies in the United States Right Now

Originally published May 9 and fully refreshed October 29, 2026, this guide compares 18 SEO and AI search agencies worth evaluating for US businesses. Explore established providers such as WebFX, Thrive, iPullRank, Siege Media, Graphite, First Page Sage, and other specialists, along with two newly added agencies—Terrier Agency and AEO Labs—that requested consideration for the update. Learn about Terrier's published GEO pricing and 21-prompt measurement framework, AEO Labs' AEO positioning, and the differences among SEO, GEO, and AEO. The guide also includes an expanded Ritner Digital profile linking to seven 2026 third-party directory features, a detailed True Blue Autos SEO case study, and the dealership's own customer-published feedback. Includes agency-selection questions, practical buying guidance, and 18 FAQs.