Keywords: Duncan Farm Site.jpg 82002542 38 58 8 N 90 30 49 W Overview of the western section of the w Duncan Farm Grafton Illinois Duncan Farm archaeological site located off the southern side of Illinois Route 100 west of Grafton Illinois Grafton in Quarry Township Jersey County Illinois Quarry Township Jersey County Illinois Jersey County Illinois United States The site is listed on the National Register of Historic Places own 2014-05-26 User Nyttend Nyttend Archaeological sites in Illinois Illinois Route 100 National Register of Historic Places in Jersey County Illinois Scenery pictures by User Nyttend |