| Other organizations in Illinois |
| Id | Name | Address | State | Established | Total Income |
| 1 | Oaklawn Cemetery Association | 4 Rushmore Dr, Glen Carbon, IL 62034 | IL | 1999-08 | $0 |
| 2 | Oakwood Water Association | 1132 Oakwood Rd, East Peoria, IL 61611 | IL | 1958-06 | $0 |
| 3 | Oasis Productions | 920 W Agatite Unit G, Chicago, IL 60640 | IL | 2004-12 | $0 |
| 4 | Obey Me Ministries | 114 Preakness Dr, Oswego, IL 60543-4082 | IL | 1964-02 | $0 |
| 5 | Obryan Cemetary | 11345 Cherry Point Street, Paris, IL 61944 | IL | | $0 |
| 6 | Oconee Baptist Church | 114 Locust St, Oconee, IL 62553 | IL | 1970-05 | $0 |
| 7 | Odin Baptist Church | PO BOX 248, Odin, IL 62870-0248 | IL | 1970-05 | $0 |
| 8 | Og Landheim Police And Working Dog Association Inc | 19420 Wolf Road, Mokena, IL 60448 | IL | | $0 |
| 9 | Ogle County Pork Producers Association | Po Box 404, Oregon, IL 61061 | IL | 1992-05 | $0 |
| 10 | Ohare Kiwi Club | 1313 Sterling Drive, Mundelein, IL 60060 | IL | | $0 |
| 11 | Oklahoma City University Employees Medical Plan Tr-Bhem Affil Instit | 200 South Wacker Drive Suite 1000, Chicago, IL 60606 | IL | 1985-01 | $0 |
| 12 | Old Du Quoin Baptist Church | 8831 Old State Route 14, Du Quoin, IL 62832-4023 | IL | 1970-05 | $0 |
| 13 | Old Settlers Days | Po Box 48, Rockton, IL 61072 | IL | 1985-10 | $0 |
| 14 | Old Union Missionary Baptist Church | 12138 Turner Dr, Mount Vernon, IL 62864-2630 | IL | 1970-05 | $0 |
| 15 | Olive Branch Baptist Church | 2892 N 1000th St, Martinsville, IL 62442-3705 | IL | 1970-05 | $0 |
| 16 | Olympia Fields Country Club Foundation | 2800 Country Club Drive, Olympia Fields, IL 60461 | IL | 2013-08 | $0 |
| 17 | Omega Psi Phi Fraternity, 132 Omicron Theta | PO BOX 2001, Carbondale, IL 62902-2001 | IL | 1953-01 | $0 |
| 18 | Omega Psi Phi Fraternity, 146 Epsilon Beta | PO BOX 852, Macomb, IL 61455-0852 | IL | 1953-01 | $0 |
| 19 | Omega Psi Phi Fraternity, 157 Pi Beta | 410 W Vernon Ave Apt 2, Normal, IL 61761-6511 | IL | 1953-01 | $0 |
| 20 | Omega Psi Phi Fraternity, 174 Iota Delta | 1425 W Lincoln Hwy, Dekalb, IL 60115-2828 | IL | 1953-01 | $0 |
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