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,   217-423-2436
Greater Kansas City Intergroup – P.O. Box 2391, Shawnee Mission, KS 66201,  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 Intergroup - 3402 Fairhaven Drive, Rapid City, SD 57702
Heart of Canada – Box 26055, Winnipeg, MB Canada R3G 3R3   email:  HeartofCanadaOAIG@gmail.com
Heart of Illinois Intergroup – P.O. Box 5606, Peoria IL 61601
Mid Continent Intergroup - 7701 E. Kellogg Ste 635, Wichita, KS 67201  316-267-5851 http://www.oawichita.org/                 
Northeast Iowa Intergroup – P.O. Box 1591 Waterloo, IA 50704, 1-800-480-7576
Northern Serenity Intergroup – P.O. Box 161051, Duluth, MN 55816,  715-363-2619
OA Links of Lincoln – 1636 West Arlington Street, Lincoln, NE 68522, 402-473-1952
Promises of Eastern Iowa Intergroup – P.O. Box 213 Iowa City, IA 52244-0213  319-351-6004
Quad Cities Intergroup – QCOA Intergroup C/O Mary H., 633 2nd Ave. West Andalusia, IL 61232, http://www.qcoa.org/
Red River Valley Intergroup – P.O. Box 9951, Fargo, ND 58106
St. Louis Bi-State Area Intergroup – 9907 Gravois Rd, Suite E., St. Louis, MO 63123 , 314-638-6070 http://www.stlouisoa.org/
Sunflower Intergroup – 5855 S. W. 22nd Terr #1, Topeka, KS 66614  http://www.sunflowerintergroupoa.org/
Tri-State Siouxland -  Box 571, Vermillion, SD  57069, 605-670-0494
Unity Intergroup – 3208 West Lake Street, #45, Minneapolis, MN 55416, 612-377-1600 http://www.overeaters.org/