Sorry I know some of these have been mentioned, but here are the ones that I have encountered so far. Note that some of these maybe not be and easy walking distance, but have camping inside of the park.
Punderson State Park, Friends of Punderson DGC, Newbury, Ohio
Delaware State Park, Gordon Holton Memorial Disc Golf Course, Delware, Ohio
Forked Run State Park, Forked Run DGC, Reedsville, Ohio
Pike Lake State Park, Pike Lake DGC, Bainbridge, Ohio
Paint Creek State Park, Paint Creek DGC, Bainbridge, Ohio
Buck Creek State Park, Buck Creek DGC, Springfield, Ohio
Burr Oak State Park, Burr Oak, DGC Glouster, Ohio
Great Seal State Park, Great Seal DGC, Chillicothe, Ohio
Deer Creek State Park, Jeremy Lewis Memorial DGC, Mt. Sterling, Ohio
Warriors Path State Park, Warriors Path DGC, Kingsport, TN
Token Creek County Park, Vallarta-Ast DGC, Deforest, WI
Lake Casitas, Coyote Point DGC, Ventura, CA
International DG Center, Appling, GA
Basil Griffin Park, Bowling Green, KY (KOA directly across the street)
Sleepy Hollow State Park, The Legend DGC, Laingsburg, MI