| Other organizations in Illinois |
| Id | Name | Address | State | Established | Total Income |
| 1 | Orr High School Alumni Association | 3515 W Polk St, Chicago, IL 60624-4114 | IL | 2013-06 | $0 |
| 2 | Orthodox Christian Alumni In Action At The University Of Chicago | 112 E John St, Champaign, IL 61820-8202 | IL | 2013-02 | $0 |
| 3 | Orthopaedic Biomedical Imaging Institute | 609 Austin Avenue, Park Ridge, IL 60068 | IL | 2012-01 | $0 |
| 4 | Orthopaedic Surgery And Sports Med Teaching And Research Foundation | 4809 Lawn Avenue, Western Springs, IL 60558 | IL | 2009-06 | $0 |
| 5 | Orthopedic Device Reference Inc | 300 S Northwest Hwy Suite 203, Park Ridge, IL 60068 | IL | 1998-06 | $0 |
| 6 | Oscar Mike Foundation | 103 Bradford Pl Se, Poplar Grove, IL 61065 | IL | 2013-04 | $0 |
| 7 | Oswegoland Heritage Association | Po Box 23 72 Polk Street, Oswego, IL 60543 | IL | 1977-06 | $0 |
| 8 | Ottawa Art League | P O Box 643, Ottawa, IL 61350 | IL | 1969-08 | $0 |
| 9 | Ottawa Eagles Youth Football Nfp | 823 Clinton St, Ottawa, IL 61350 | IL | 2006-03 | $0 |
| 10 | Ottawa Jewish Cemetery | 701 Lasalle Street, Ottawa, IL 61350 | IL | 1953-10 | $0 |
| 11 | Otter Creek Historical Society | 105 West Main St, Durand, IL 61024 | IL | 1983-11 | $0 |
| 12 | Our Angel Of Hope | 902 Maple Street, Albion, IL 62806 | IL | 2002-06 | $0 |
| 13 | Our Caring Closet Nfp | 205 N First St, Wilmington, IL 60481-1102 | IL | 2012-07 | $2,208 |
| 14 | Our Creative Hands Inc | 8757 S Morgan St, Chicago, IL 60620-3251 | IL | 2012-10 | $0 |
| 15 | Our Youth Cdc, Our Youth | 3966 W Grand, Chicago, IL 60651 | IL | 2012-03 | $0 |
| 16 | Outreach Baptist Church Inc | PO BOX 565, Collinsville, IL 62234-0565 | IL | 2011-11 | $0 |
| 17 | Outreach Family Services And Community Center | 4302 W Madison St, Chicago, IL 60624-2223 | IL | 2012-10 | $0 |
| 18 | Outreach With Lacrosse & Schools | PO BOX 14196, Chicago, IL 60614 | IL | 2013-01 | $0 |
| 19 | Over The Reinbow Inc | 2142 Wooley Road, Oswego, IL 60543 | IL | 2009-01 | $0 |
| 20 | Overcomers With Purpose Inc Nfp | 14509 Wabash Ae, Riverdale, IL 60827 | IL | 2013-07 | $0 |
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