Duncan Farm
U.S. National Register of Historic Places
The site from Illinois Route 100
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Location	Southern side of Illinois Route 100, ½ mile west of Brussels Ferry
Coordinates	38°58′05″N 90°30′49″W / 38.96806°N 90.51361°W / 38.96806; -90.51361
Area	55 acres (22 ha)
NRHP reference No.	82002542[1]
Added to NRHP	August 24, 1982

Duncan Farm is an archaeological site located on a farmstead south of Illinois Route 100 in Jersey County, Illinois, near the city of Grafton. The site, which dates from the Woodland period, includes two burial mounds and a habitation site. The site was part of the Hopewell exchange system in Illinois and is the closest neighboring village site to the Golden Eagle regional transaction center, a major trade and social hub in the system. Archaeologists have suggested that the site is a local transaction center in the Golden Eagle site's region due to its two large mounds, which are roughly 200 feet (61 m) long and 100 feet (30 m) wide each. In addition, the site is archaeologically significant due to its distinctive stratification, which allows its artifacts to be easily dated.^[2]

The site was added to the National Register of Historic Places on August 24, 1982.^[1]

• Smith-Duncan House and Eastman Barn, historic buildings on the same farmstead

v t e Hopewellian peoples
Woodland period List of Hopewell sites Mound Builders List of archaeological periods (North America)
Ohio Hopewell	Beam Farm Benham Mound Cary Village Site Cedar-Bank Works Dunns Pond Mound Ellis Mounds Ety Enclosure Ety Habitation Site Everett Knoll Complex Fort Ancient Fortified Hill Works Great Hopewell Road High Banks Works Hopeton Earthworks Hopewell Culture National Historical Park Indian Mound Cemetery Keiter Mound Marietta Earthworks Moorehead Circle Mound of Pipes Nettle Lake Mound Group Newark Earthworks Oak Mounds Orators Perin Village Site Pollock Works Portsmouth Earthworks Rocky Fork Enclosures Rocky Fork Mounds Seip Earthworks and Dill Mounds District Shawnee Lookout Shriver Circle Earthworks Stubbs Earthworks Tremper Mound and Works Williamson Mound Archeological District
Crab Orchard culture	Carrier Mills Archaeological District Cleiman Mound Hubele site Mann site Mount Vernon Site O'byams Fort site Wilson site Yankeetown site
Goodall focus	Goodall site Norton Mound group
Havana Hopewell culture	Albany Mounds State Historic Site Dickson Mounds Duncan Farm Golden Eagle-Toppmeyer Site Kamp Mound Site Mound House site Naples Archeological District Naples Mound 8 Ogden-Fettie Site Rockwell Mound Sinnissippi Mounds Toolesboro Mound Group
Kansas City Hopewell	Cloverdale archaeological site Renner Village Archeological Site Trowbridge Archeological Site
Marksville culture	Crooks Mound Grand Gulf Mound Marksville Prehistoric Indian Site Mott Archaeological Preserve
Miller culture	Bynum Mound and Village Site Ingomar Mound Miller Site Pharr Mounds Pinson Mounds
Point Peninsula complex	Lewiston Mound Serpent Mounds Park LeVescounte Mounds
Swift Creek culture Santa Rosa-Swift Creek culture	Crystal River Archaeological State Park Etowah Indian Mounds Leake Mounds Kolomoki Mounds Miner's Creek site Pierce Site Swift Creek mound site Third Gulf Breeze Yearwood site Yent Mound
Other Hopewellian peoples	Armstrong culture Copena culture Fourche Maline culture Laurel complex Saugeen complex Old Stone Fort (Tennessee)
Exotic trade items	Copper Galena Mica Fresh water pearls Obsidian Pipestone Sea shells
Related topics Ancient Monuments of the Mississippi Valley Black drink burial mound Ceremonial pipe Effigy mound Hopewell pottery Hopewell Ceremonial Earthworks Horned Serpent Eastern Agricultural Complex Underwater panther