- Pea Patch Island: Island, U.S. State, Delaware, Delaware River, Delaware Bay
- Dover, Delaware by Frederic P. Miller, Agnes F. Vandome, et all 2010-07-01
- Chesapeake Bay: Estuary, Maryland, Virginia, Drainage basin, Pennsylvania, Delaware, West Virginia, Susquehanna River, Kent County, Maryland, Harford County, ... Potomac River, Chesapeake Bay Bridge
- New Jersey Route 90: Betsy Ross Bridge, Delaware River, Interstate 95 in Pennsylvania, New Jersey Route 73, Cinnaminson Township
- Newport, Delaware: New Castle County, Delaware, Delaware, Oliver Evans, Christina River, Delaware Route 141, Duke of York
- Delaware, Ohio
- Southern Tier: New York State, Catskill Mountains, Pennsylvania, Delaware County, New York, Northern Tier (Pennsylvania)
- The Valley of the Delaware and Its Place in American History. With 58 Illustrations from Actual Photographs. by John Palmer Garber, 1934
- Troy Township, Delaware County, Ohio
- Upper Darby Township, Delaware County, Pennsylvania: Insert subtitle
- Concord Township, Delaware County, Ohio
- Salem County, New Jersey: New Jersey, Salem, New Jersey, Delaware Valley, Supawna Meadows National Wildlife Refuge, Township, New Jersey
- A Gazetteer of Delaware (Dept. of the Interior USGS Bulletin 230, Series F, Geography 38) by Henry Gannett, 1904
- Delaware Township, Defiance County, Ohio
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