I came across a list of 16 riding areas covering some parts of Ill an Mo. Here they are and websites where applicable.

The Cliffs Offroad Park- Marseilles, ill
www.thecliffsinsaneterrain.com

Little Egypt Public OHV- Marion,Ill
www.leormc.com

Rocky Glen OHV Park- Loves Park, Ill
www.rockyglenohv.com

South Fork Dirt Riders- Taylorville, Ill
www. Southforkdirtriders.com

Clark County Park District Mill Park- Marshall, Ill
www.clarkcountyparkdistrict.com

Williams Hill Pass OHV Park- Harrisburg, Ill
www.williamshillpass.com

Jim Edgar Panther Creek State Fish & Wildlife-Chandlevile, Ill
217-452-7741

Harpoles Heartland Lodge- Nebo, Ill
www.heartlandlodge.com

Brushy Ridge Motorsports- Browning, Ill
www.brushyridgemotorsports.com

Crooked Creek OHV Riding Area- Winchester, Ill
217-742-3415

Atkison Motorsports Park- Atkinson, Ill
309-936-7878

Coyote Atv Trail Riders- Coulterville, Ill
617-758-2851

Smurfwood Trails- Canton, Mo
www.smurfwoodtrails.com

Finger Lakes State Park- Columbia, Mo
www.mostateparks.com/fingerlakes.htm

St.Joe State Park- Park Hills, Mo

Badlands Offroad Park- Attica, IN
www.badlandsoffroad.com

St Joe info- www.mostateparks.com/stjoe

I don't know how updated this info is. I will edit if any of these are no longer good.

Also Leerjack.com nice place