Technical SEO companies

One of the largest full-service US agencies, WebFX pairs a very deep in-house bench with published, itemised pricing tiers — unusual transparency at this scale.

A long-established Colorado agency with a large in-house team and its own analysis tooling for content and technical audits.

A hospitality-heavy digital firm with its own CMS and schema platform, strong on structured data at multi-location scale.

A data-heavy consultancy with a strong analytics engineering culture — big-query pipelines, custom dashboards and a public knowledge-sharing habit.

An Iowa-founded full-service agency that grew nationally while keeping web development and SEO tightly coupled.

An enterprise-only owned-asset marketing firm that works almost exclusively with Fortune 500 brands on large content and authority programmes.

A broad SMB-to-mid-market agency with a strong multi-location and franchise practice across the Sun Belt.

A digital experience consultancy where SEO is embedded in platform builds — useful when the site itself is the bottleneck.

One of the UK's longest-running digital agencies, strongest on B2B and industrial clients with long sales cycles.

A long-running B2B and industrial agency with rigorous lead validation — calls and forms are reviewed before being counted.

A human-centred full-service agency where SEO sits alongside brand, UX and content for organisations with complex audiences.

A performance marketing firm with a large regulated-industries practice, strong in healthcare and financial compliance constraints.

One of Canada's longest-established search agencies, covering organic, local and paid for mid-market clients.

A Florida agency combining organic search with reputation and PR work, common for consumer-facing brands in competitive markets.

An Arizona agency with a content-and-authority model, active in competitive commercial niches for over two decades.

One of the oldest SEO consultancies in the world, still running audits, training and enterprise consulting from Southern California.

A strategy-led agency known for its forecasting model, which projects traffic and revenue outcomes before a retainer starts.

A long-running growth agency working across full-funnel acquisition for scale-ups and established brands.

One of the longest-running search agencies in the Pacific Northwest, with a measurement-first approach to organic programmes.

A long-established Texas agency serving regional service businesses with combined branding, web and local search work.

One of Australia's largest performance agencies, delivering organic and paid at scale across APAC and the US.

An ecommerce-first agency combining custom store development with organic growth for catalogue-heavy B2B and B2C sellers.

A technology-led agency using its own crawling and analysis platform to prioritise technical work on large sites.

A growth agency with its own measurement platform, positioning SEO as one input into a modelled revenue forecast.

A Brisbane agency running integrated organic and paid programmes, with strong education and tourism experience.

A Minneapolis agency blending SEO with paid and analytics for Upper Midwest retail and B2B brands.

A Philadelphia-area agency built around local lead generation for trades, contractors and professional services.

A family-run New Jersey agency that moved from direct mail into digital, now running practical SEO for regional B2B clients.

Ecommerce-heavy agency with deep Shopify and BigCommerce experience, pairing storefront development with organic growth.

A widely recognised mid-market SEO agency with a broad SMB base and a reputation for clear, jargon-free reporting.

A full-service digital agency split across Nottingham and London, pairing organic search with paid media and analytics.

A Dallas-area agency with a strong technical audit practice, often brought in to diagnose traffic losses other teams cannot explain.

A home services specialist built around tracked phone calls and booked jobs for HVAC, plumbing and electrical contractors.

A Chicago agency that built its reputation on data-led digital PR campaigns that reliably earn national coverage.

A Virginia B2B agency with a strong lead-quality focus and long experience in complex, considered-purchase sales cycles.

A Midwest agency pairing SEO with web design for regional B2B and institutional clients that need steady, unflashy growth.

A high-volume SMB and mid-market agency combining web builds with organic and paid — one of the most-reviewed agencies in the US.

A high-volume small-business SEO provider with the lowest realistic entry pricing among established US agencies.

A London consultancy known for technical depth and editorial-grade content, working mainly with large brands and publishers.

A healthcare-focused performance agency with a multi-location patient acquisition practice and its own call-tracking stack.

Neil Patel's global performance agency, with a large US footprint and its own tooling stack (Ubersuggest, AnswerThePublic) feeding client research.

A link building specialist that has stayed in one lane for well over a decade, with fully manual prospecting and outreach.

A California agency with a behavioural-marketing angle, working heavily with treatment centres and professional practices.

A content-and-links agency whose model is earning coverage through original research and design-led assets rather than outreach volume.

An SEO-only shop that deliberately avoids paid media, selling a single discipline with clear deliverable-level scoping.

A Leeds agency specialising in link acquisition and digital PR for competitive, heavily regulated verticals.

A development-led agency where SEO sits alongside an in-house build practice, useful for replatforming projects.

A Calgary agency focused on industrial, trades and B2B clients across Western Canada.

A local search specialist with long-running original research on Google's local pack and map ranking factors.

A Pacific Northwest performance agency with ecommerce and app-adjacent growth experience alongside core organic work.

A growth agency weighted toward ecommerce, running organic alongside paid social and search.

A Sydney search agency combining technical SEO with digital PR and content for competitive national terms.

An SEO-only agency with specialist pods for technical, local and content work, operating in Australia and the UK.

A Louisiana agency focused on B2B organic growth, with an early and public emphasis on AI-assisted content workflows.

A Toronto agency covering organic, local and paid for small and mid-sized Canadian businesses.

A full-service digital agency formed from established Canadian shops, working across Vancouver, Toronto and New York.

A Toronto agency working exclusively with B2B SaaS companies on demand generation and organic pipeline.

A small Denver agency with a practical content-and-technical mix, working mostly with Rocky Mountain regional brands.

A Utah agency known for creative content and visual assets that earn links, backed by solid technical fundamentals.

The agency behind the SEO Spider crawler, with a technical audit and search marketing practice alongside the software.

An East Anglian agency running search, paid and build work as a single strategy engagement rather than separate retainers.

A search and digital PR agency with an in-house build team, best known for structured processes and transparent reporting.

A BC agency built around local search and paid media for service businesses with a defined catchment area.

A small Cleveland shop working mostly with Ohio manufacturers and professional services firms on lead-focused organic programmes.

A technical consultancy at the front edge of machine learning and generative search, known for research the rest of the industry cites.

A search-first creative agency built around digital PR and campaign-led link acquisition for consumer brands.

A boutique Toronto consultancy handling audits, recovery work and ongoing organic growth for smaller sites.

A regional Queensland agency pairing website builds with local search for trades and small business clients.

A remote-first SEO agency with a heavy link acquisition practice and a strong emphasis on strategy documentation up front.

An SEO-only agency positioned as an outsourced search department, including white-label delivery for other agencies.

A legal-only SEO agency working exclusively with personal injury and mass tort firms in some of the most expensive keyword markets in the US.

A Western Australian specialist working almost entirely with Perth-area businesses on local visibility.

A boutique Sydney agency focused on local search for small and medium service businesses.

A small, senior team focused on medical and legal practices, with content written by people who understand the vertical.

A small prairie-based agency working with local service businesses on map pack and organic visibility.