Fathom was revealed as one of the leading search marketing and sites by SEO 2.0, a website dedicated to online promotion and optimisation.
The accolade follows the company’s decision to redesign its site to make it more user friendly and was launched earlier this year.
Bill Fox, president of Fathom SEO said: "Our website offers a wealth of information for anyone looking to better understand the search engine optimisation industry.
"We wanted to make this information organised and readily available with an aesthetically pleasing website design."
He went on to say that the new site incorporated a search engine marketing forum and blog as well as access to various articles, case studies and white papers.
Among the other sites singled out for inclusion in the 15 best SEO company website designs was Catics of South Africa, Merix of Poland, US-based Netconcepts and UK companies Spannerworks and Ultimate Presence.