The collections of the Archives are open to researchers interested in the history of Sandwich and the families who lived here. The collections include:
- Family files concentrating on those having ties to Sandwich and a collection of published vital records and genealogies.
- The Sandwich Historical Commission files which provide information on buildings and sites in Sandwich.
- Vertical files spanning 300 plus years of Sandwich history and community life, both municipal and civic.
- Cemetery records and an index of gravestone inscriptions.
- Old Local Area Maps
- Microfilm of censuses and Sandwich newspapers
- Photographs and postcards.
- Sandwich town records such as town meeting minutes from 1651, and assessor's records from 1783 - 1860.
- Volumes of materials that concentrate on Sandwich and Cape Cod.
- Donated materials from Sandwich families.