The average mosque in England and Wales attracts 400 attendees at Friday prayer meetings, while providing a range of community services, a survey has found.
The survey of 255 mosques also revealed that on average they had an estimated annual income of £233,452.
Most - 83% - had been established more than 10 years ago, it found.
Many of the mosques were providing education for children, charity fundraising and leisure activities, the Charity Commission study said.
The independent survey was prepared by BMG Research and commissioned by the Charity Commission's faith and social cohesion unit to provide information on mosques which has not been previously gathered.
Dame Suzi Leather, chair of the Charity Commission, said the research revealed the important contribution mosques were making to communities.
She said: "I'm really interested to see the wide range of services that mosques provide, from healthy living activities to legal advice services and from fundraising for those in financial hardship to sport and leisure.
"The Charity Commission has an essential part to play in supporting all faith-based charities so that they can maximise the contribution they make to society."
Seyyed Ferjani, chair of the Mosques and Imams National Advisory Board welcomed the research, saying it was a useful starting point.
He said: "I hope it will also be a useful resource for Muslim communities throughout England and Wales. The helpful advice and information provided by the faith and social cohesion unit is clearly of benefit to those mosques which responded to the survey. "