From Ancestry.com Wiki
Weston is a town in Massachusetts. It was formed in 1713 and was previously called Watertown. It can be found in Middlesex county and is a part of the Southern registry of deed district. For more information, contact the county at Town House Rd., Weston 02193. On the attached map, Weston is shown as 44 in Middlesex county.
For information about the state of Massachusetts see Massachusetts Family History Research.