Pitchero provides a platform in which over 5,000 non-league football - and other sporting - clubs can create a professional looking website using their template service.
The rankings are produced weekly, based on site visits and frequency and quality of new content.
Commercial Manager - and site editor - Simon Jasinski, said: "When the BoshamFC.co.uk domain was brought into Pitchero in July 2012, I initially had the intention to make it a central hub for all the club news - which was dotted about all over the place before - but its really superseded this beyond expectation.
"The site has of course benefited from the momentum we've had as a club in being successful on the pitch last season and the interest in our Sport England funding."
He added: "It's a labour of love, and I'm grateful to everyone who has helped us get to the top - which for a village Step 7 side, we believe to be something of a coup - especially considering other clubs (at the top of the rankings) play as high as the Conference.
"If being number one helps in driving positive awareness of who we are, then that has got to be a good thing."
Last season BoshamFC.co.uk generated around 100,000 page views, with clicks as far a field as India and Australia - giving great exposure to the Robins, their sponsors, and Bosham village.