Central Iowa Intergroup – P.O. Box 30068, Des Moines, IA 50310 http://www.cii.oaregion4.org   

Decatur Outreachers Intergroup - 950 Stevens Creek Circle, Forsyth, IL 62535-9622,   217-423-2436 

Greater Kansas City Intergroup – P.O. Box 2391, Shawnee Mission, KS 66201-2391,  913-383-5933  http://www.kansascityoa.org/

Greater Omaha Intergroup – P.O. Box 34117, Omaha, NE 68134, 402-344-7925 http://www.omahaoa.org/  

Greater Ozarks Intergroup – P.O. Box 8675, Springfield, MO 65801 

Hills & Plains OA Intergroup - PO Box 3295, Rapid City, SD 57719 

Heart of Canada Intergroup  - 240 Heartland Trail, Headingley, Manitoba R4H 0A5  email:  HeartofCanadaOAIG@gmail.com

Heart of Illinois Intergroup – P.O. Box 5606, Peoria IL 61601  hoi.oaregion4.org

Mid-Continent Intergroup - 7701 E. Kellogg Ste 830, Wichita, KS 67207  316-267-5851 http://www.oawichita.org/                 

Northeast Iowa Intergroup – P.O. Box 1591 Waterloo, IA 50704, 319-610-7192 www.neiowa.oaregion4.org

Northern Serenity Intergroup – P.O. Box 161051, Duluth, MN 55807,  715-363-2619 

OA Links of Lincoln – PO Box 80403, Lincoln, NE 68501-0403, 402-473-1952 

Promises of Eastern Iowa Intergroup – P.O. Box 213, Iowa City, IA 52244-0213  319-351-6004  promises.oaregion4.org

Quad Cities Intergroup – QCIG, 4343 16th Street, Box 177, Moline, IL 61265  http://www.qcoa.org/

Red River Valley Intergroup – P.O. Box 9951, Fargo, ND 58106-9951 

St. Louis Bi-State Area Intergroup – 9907 Gravois Rd, Suite E., St. Louis, MO 63123 , 314-638-6070 http://www.stlouisoa.org/

Sunflower Intergroup – PO Box 67181, Topeka, KS 66667  http://www.sunflowerintergroupoa.org/

TriState Siouxland OA Intergroup –  402 West Main, Vermillion, SD 57069, 605-670-0494

Unity Intergroup – 3208 West Lake Street, #45, Minneapolis, MN 55416, 612-377-1600 http://www.overeaters.org/