- Ashland Nature Center
- Assawoman Canal
- Assawoman Wildlife Area
- Assawoman Wildlife Area McCabe Tract
- Assawoman Wildlife Area Miller Neck Tract
- Assawoman Wildlife Area Muddy Neck Tract
- Assawoman Wildlife Area Piney Point Tract
- Barnes Woods Nature Preserve
- Bethany Beach Nature Center & Conservation Area
- Blackbird Creek Reserve
- Blackbird State Forest
- Blackbird State Forest - Barlow Tract
- Blackbird State Forest - Bruce C. Ennis Tract
- Blackbird State Forest - Cypress Complex
- Blackbird State Forest - Dulany Manor Tract
- Blackbird State Forest - Headquarters-Tybout Tract
- Blackbird State Forest - Jones Tract
- Blackbird State Forest - Naudain Tract
- Blackbird State Forest - Oak Hill Tract
- Blackbird State Forest - White Road Tract
- Blackbird State Forest - Wright Tract
- Blackiston Wildlife Area
- Bombay Hook National Wildlife Refuge
- Burton Island Nature Preserve
- Cape Henlopen State Park
- Capital Green/Pauls Property
- Cedar Swamp Rocks Tract
- Cedar Swamp Wildlife Area
- Chambers House Nature Center
- Chestnut Hill Ironmine Preserve
- Delaware Seashore State Park Fresh Pond
- DNERR Blackbird Creek Reserve - McKinley Tract
- Eolyne K Tunnell Nature Preserve
- Fork Branch Nature Preserve
- Fork Branch Nature Preserve
- Fort Delaware State Park
- Great Cypress Swamp
- Hunn Conservation Area
- James Farm Ecological Preserve
- Kershaw Park
- Killens Pond State Park
- Little Creek Wildlife Area - Davey Crockett Tract
- Little Creek Wildlife Area - Main Tract
- Little Creek Wildlife Area - Tarburton Tract
- Middle Run Natural Area
- Midlands Wildlife Area
- Milford Millponds Nature Preserve
- Norman G. Wilder Wildlife Area - Bartsch Tract
- Norman G. Wilder Wildlife Area - Bennett Tract
- Norman G. Wilder Wildlife Area - Caulk Tract
- Norman G. Wilder Wildlife Area - Petersburg Tract
- Norman G. Wilder Wildlife Area - Willow Grove Tract
- Okie Preserve Poplar Thicket Farm
- Pea Patch Island Nature Preserve
- Pemberton Forest Nature Preserve - Ponders Tract
- Prime Hook National Wildlife Refuge
- Redden State Forest - Appenzellar Tract
- Redden State Forest - Bailey Tract
- Redden State Forest - Barr Tract
- Redden State Forest - Chesapeake Tract
- Redden State Forest - Collins Pond Tract
- Redden State Forest - Day Tract
- Redden State Forest - Deep Creek Tract
- Redden State Forest - Ellendale Tract
- Redden State Forest - Eskridge Tract
- Redden State Forest - Headquarters Tract
- Redden State Forest - Jester Tract
- Redden State Forest - Long Tract
- Redden State Forest - Marvel Tract
- Redden State Forest - Owens Tract
- Redden State Forest - Rayne Tract
- Redden State Forest - Sill Tract
- Redden State Forest - Townsend Tract
- Redden State Forest - Tunnell Tract
- Saint Jones River Corridor
- Seal Island
- Sherwood Forest
- St. Jones Reserve
- Taber State Forest
- Ted Harvey Conservation Area - Buckaloo Tract
- Ted Harvey Conservation Area - Island Farm Tract
- Ted Harvey Conservation Area - Logan Lane Tract
- Ted Harvey Conservation Area - Morris Tract
- Ted Harvey Conservation Area - Roberts Tract
- White Clay Creek State Park
- William M. Redd, Jr. Park
- Woodland Beach Wildlife Area - Goldsborough/Ennis/Cabin Tracts
- Woodland Beach Wildlife Area - Lighthouse Island Tract
- Woodland Beach Wildlife Area - McKay Tract