From Ancestry.com Wiki
Royalston is a town in Massachusetts. It was formed in 1765 and was previously called Royalshire tract. It can be found in Worcester county and is a part of the Worcester registry of deed district. For more information, contact the county at 13 The Common, Royalston 01368. On the attached map, Royalston is shown as 1 in Worcester county.
For information about the state of Massachusetts see Massachusetts Family History Research.