Area code 413
It is the largest numbering plan area in the Commonwealth , and extends from the New York state line eastward into Worcester County ( only the towns of Hardwick and Warren ) , while excluding the Franklin County towns of Orange , New Salem , Warwick , and Wendell , which use the overlay of area codes 978 and 351 . 
<triplet> Worcester County <subj> Franklin County <obj> shares border with <triplet> Hardwick <subj> Worcester County <obj> located in the administrative territorial entity <triplet> Warren <subj> Worcester County <obj> located in the administrative territorial entity <triplet> Franklin County <subj> Worcester County <obj> shares border with