| Other organizations in Iowa |
| Id | Name | Address | State | Established | Total Income |
| 1 | Oaknoll Foundation | 1 Oaknoll Ct, Iowa City, IA 52246-5250 | IA | 1991-08 | $170,044 |
| 2 | Oakville Volunteer Foundation Inc | 1848 D Ave, Mediapolis, IA 52637-9495 | IA | 2009-02 | $445,694 |
| 3 | Obermann-Beck Foundation | 18927 110th St, Danville, IA 52623-9524 | IA | 1987-07 | $827 |
| 4 | Obrien County Economic Development | 160 S Hayes Ave, Primghar, IA 51245-7723 | IA | 2001-09 | $180,284 |
| 5 | Obrien County Livestock Show And Agricultural Association | PO BOX 332, Primghar, IA 51245-0332 | IA | 1925-07 | $283,159 |
| 6 | Obrien Family Foundation | 3810 Brentwood Dr, Des Moines, IA 50312-4609 | IA | 2009-01 | $4,439 |
| 7 | Occupational Safety & Health Advisory Council | 1000 Grand Ave, Des Moines, IA 50309-3027 | IA | 1976-02 | $71,724 |
| 8 | Ocdc Inc | 121 Albany Ave Ne, Orange City, IA 51041 | IA | 2008-04 | $1,856,528 |
| 9 | Ocheyedan Christian School | 1155 Oak St, Ocheyedan, IA 51354-7557 | IA | 1975-10 | $140,354 |
| 10 | Ochylski Family Foundation | 300 Walnut St Ste 295a, Des Moines, IA 50309-2212 | IA | 1997-06 | $1,123,347 |
| 11 | Ockenfels Family Foundation | 3 E Benton St, Iowa City, IA 52240-1509 | IA | 2001-02 | $2,336 |
| 12 | Oconnor Tr, C-O Robert C Reimer | PO BOX 278, Vail, IA 51465-0278 | IA | 1992-03 | $112 |
| 13 | Octagon Center For The Arts | 427 Douglas Ave, Ames, IA 50010-6213 | IA | 1968-08 | $397,294 |
| 14 | Odd Fellows Building Association | 625 Main St Box 433, Keokuk, IA 52632-5451 | IA | 1934-09 | $152,211 |
| 15 | Odebalt Development Corporation | PO BOX 477, Odebolt, IA 51458-0477 | IA | 1969-10 | $37,209 |
| 16 | Oelwein Area Economic Development Foundation | 25 W Charles St, Oelwein, IA 50662-1641 | IA | 1987-08 | $199,239 |
| 17 | Oelwein Area United Way Inc | 25 W Charles St, Oelwein, IA 50662-1641 | IA | 1984-12 | $72,838 |
| 18 | Oelwein Community Plaza Foundation | 25 W Charles St, Oelwein, IA 50662-1641 | IA | 1991-10 | $42,026 |
| 19 | Oelwein Foundation | 310 11th Ave Nw, Independence, IA 50644-1641 | IA | 1982-01 | $50,060 |
| 20 | Oelwein Senior Citizens Housing Corporation | 302 1st St E, Independence, IA 50644-2815 | IA | 1977-06 | $205,823 |
| 21 | Office Aides, Representative Payee Services | 105 N Pierce St, Mount Ayr, IA 50854-1616 | IA | 2009-08 | $3,044 |
| 22 | Ogden Development Corp Inc | PO BOX X, Ogden, IA 50212-0823 | IA | 1971-06 | $23,484 |
| 23 | Ohalloran International Foundation, C-O James F Ohalloran | 3311 Adventureland Dr, Altoona, IA 50009-9593 | IA | 1992-10 | $104,732 |
| 24 | Ohnward Fine Arts Center | 1215 E Platt St, Maquoketa, IA 52060-2536 | IA | 2001-12 | $195,917 |
| 25 | Ohnward Foundation, Krista Grant | PO BOX 968, Maquiketa, IA 52060-0968 | IA | 2005-01 | $225,987 |
| 26 | Okoboji Community School Foundation | PO BOX 147, Milford, IA 51351-0147 | IA | 1997-02 | $10,532 |
| 27 | Okoboji Lakes Bible And Missionary Conference Association | PO BOX 709, Arnolds Park, IA 51331-0709 | IA | 1988-03 | $462,972 |
| 28 | Okoboji Protective Association | Po Box 128, Milford, IA 51351 | IA | 1994-11 | $0 |
| 29 | Okoboji Yacht Club | PO BOX 544, Milford, IA 51351-0544 | IA | 1975-03 | $126,327 |
| 30 | Okoboji Yacht Club Sailing School Inc 082897 | PO BOX 544, Milford, IA 51351-0544 | IA | 1998-10 | $1,050,630 |
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