SEO companies with analytics and measurement depth

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.

A large independent challenger agency where SEO sits inside a full-funnel media practice with shared incrementality measurement.

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.

One of the largest independent performance agencies in the US, with marketplace and retail media depth alongside organic search.

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.

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

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

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

A B2B and SaaS specialist built around pipeline metrics rather than rankings, with its own 'Customer Generation' operating model.

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

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

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.

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