Sunderland was chartered on June 29, 1761. During part of the Revolutionary War, the Allen brothers, Ethan and Ira, lived in Sunderland. The town was chartered, in 1761, but its organization did not take place until July 7, 1763, and that meeting was held in Pownal. 
The Vermont Historical Gazetteer is a 5 volume set of historical information by Abby Maria Hemenway with Volume I published in 1867 and Volume V completed in 1891 after her death. Also available online in PDF format at this link.
FamilySearch Historical Records Collection has Vermont birth, death, and marriage records online.
The probate district for Sunderland is Manchester.
Manchester Probate Court
P.O. Box 446
Manchester, VT 05846
Phone: (802) 362-1410
The following is a list of cemeteries in present-day Sunderland. For location of cemeteries, see Cemeteries of Vermont, Bennington County, website at this link.
- Ira Allen Cemetery - inscriptions at Find A Grave site.
- Lawrence Cemetery (aka Sunderland Hill Cemetery) - inscriptions at Find A Grave site.
- Mount Pleasant Cemetery (aka South End Cemetery) - inscriptions at Find A Grave site.
The Family History Library has microfilm of original records from the Sunderland Town Clerks Office. These include Vital records index, 1750-1895, Land records, 1755-1915; index to land records, 1760-1952, and Records of births, marriages, and deaths, 1883-1994; card index to births, marriages, deaths, 1868-1994.
Sunderland Town Clerk
181 S Rd.
Sunderland, VT 05252
Phone: (802) 375-6106
Libraries and Historical Societies
- History of the Town of Sunderland, http://www.rootsweb.ancestry.com/~vermont/BenningtonSunderland.html