Folders with copies of entries in the Church Registers for St Mary's Church are in the church. Baptisms, Marriages and Deaths are available back to 1545. There are some omissions where pages or years were missing, as well as possible typist errors/omissions, but generally it is a comprehensive list up until 2013. These links will open the relevant register in a new window.
Another source of the information is at the Dorset County Records Office in Dorchester. http://www.ancestor-search.info/SRC-Register.htm