| Other organizations in Iowa |
| Id | Name | Address | State | Established | Total Income |
| 1 | Oakland Mills Cemetery Assn | 2615 Franklin Ave, Mt Pleasant, IA 52641 | IA | 1953-01 | $0 |
| 2 | Oakland Volunteer Fire And Rescue Department | 706 Park Lane, Oakland, IA 51560 | IA | 2005-03 | $15,407 |
| 3 | Oaknoll Foundation | 1 Oaknoll Ct, Iowa City, IA 52246-5250 | IA | 1991-08 | $177,053 |
| 4 | Oakville Volunteer Foundation Inc | 1848 D Ave, Mediapolis, IA 52637-9495 | IA | 2009-02 | $216,897 |
| 5 | Obermann-Beck Foundation | 18927 110th St, Danville, IA 52623-9524 | IA | 1987-07 | $111 |
| 6 | Obrien County Economic Development | PO BOX 616, Primghar, IA 51245-0616 | IA | 2001-09 | $190,845 |
| 7 | Obrien County Livestock Show And Agricultural Association | PO BOX 332, Primghar, IA 51245-0332 | IA | 1925-07 | $328,731 |
| 8 | Obrien Family Foundation | 3810 Brentwood Dr, Des Moines, IA 50312-4609 | IA | 2009-01 | $50,093 |
| 9 | Occupational Safety & Health Advisory Council | 1000 Grand Ave, Des Moines, IA 50309-3027 | IA | 1976-02 | $57,049 |
| 10 | Ocdc Inc | 121 Albany Ave Ne, Orange City, IA 51041 | IA | 2008-04 | $2,618,002 |
| 11 | Ocheyedan Christian School | 1155 Oak St, Ocheyedan, IA 51354-7557 | IA | 1975-10 | $140,354 |
| 12 | Ochylski Family Foundation | 300 Walnut Street, Des Moines, IA 50309-2224 | IA | 1997-06 | $3,674,285 |
| 13 | Ockenfels Family Foundation | 3 E Benton St, Iowa City, IA 52240-1509 | IA | 2001-02 | $53,326 |
| 14 | Oconnor Tr, C-O Robert C Reimer | PO BOX 278, Vail, IA 51465-0278 | IA | 1992-03 | $112 |
| 15 | Octagon Center For The Arts | 427 Douglas Ave, Ames, IA 50010-6213 | IA | 1968-08 | $326,635 |
| 16 | Odd Fellows Building Association | 625 Main St Box 433, Keokuk, IA 52632-5451 | IA | 1934-09 | $152,211 |
| 17 | Odebalt Development Corporation | PO BOX 477, Odebolt, IA 51458-0477 | IA | 1969-10 | $21,992 |
| 18 | Oelwein Area Economic Development Foundation | 25 W Charles St, Oelwein, IA 50662-1641 | IA | 1987-08 | $193,933 |
| 19 | Oelwein Area United Way Inc | PO BOX 547, Oelwein, IA 50662-0547 | IA | 1984-12 | $81,443 |
| 20 | Oelwein Community Plaza Foundation | 25 W Charles St, Oelwein, IA 50662-1641 | IA | 1991-10 | $34,075 |
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