Sunderland is a small, rural unincorporated community located at the crossroads of MD 2, MD 4, MD 262, Dalrymple Road, and Pushaw Station Road in Calvert County, Maryland, approximately 5 miles south of Dunkirk, Maryland and 10 miles north of Prince Frederick, Maryland. Although Sunderland is not incorporated and does not have a central business district, it does have a zip code, 20689. However, as of November 2007, the former Sunderland post office had closed its doors due to a lease dispute without opening a new location, and postal officials are determining where to locate a new post office location.
- Calvert Recorder. "Lease issue closes post office- November 10, 2007".
- Staff (2008-04-15). "National Register Information System". National Register of Historic Places. National Park Service.
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