| Other organizations in Wisconsin |
| Id | Name | Address | State | Established | Total Income |
| 1 | Oconomowoc Newcomers & Neighbors | Po Box 434, Oconomowoc, WI 53066 | WI | | $0 |
| 2 | Oconto County Farm Bureau Co-Operative | Po Box 5550, Madison, WI 53705 | WI | 1948-05 | $0 |
| 3 | Oconto Falls Education Association | PO BOX 8003, Madison, WI 53708 | WI | 1971-01 | $0 |
| 4 | Oconto Falls Education Support Personnel | PO BOX 8003, Madison, WI 53708 | WI | | $0 |
| 5 | Oconto Falls Sportsmen Club Inc Stiles Wi 54172 | 5974 Fireside Road, Oconto Falls, WI 54154 | WI | 2011-12 | $0 |
| 6 | Oconto Gun Club Inc Co Trunk S One Half Mi S | Po Box 406, Oconto, WI 54153 | WI | 1958-08 | $0 |
| 7 | Oconto Literacy Charter School | 810 Scherer Avenue, Oconto, WI 54153 | WI | 2014-07 | $0 |
| 8 | Oconto Support Staff Association | PO BOX 8003, Madison, WI 53708 | WI | | $0 |
| 9 | Oconto Teachers Education Association | PO BOX 8003, Madison, WI 53708 | WI | 1971-04 | $0 |
| 10 | Old Saint Mary Catholic Congregation | 836 N Broadway, Milwaukee, WI 53202-3608 | WI | 1946-03 | $0 |
| 11 | Olde Norwood Neighborhood Association | 919 12th Ave, Green Bay, WI 54304 | WI | | $0 |
| 12 | Omicron Kappa Upsilon Honorary Dental Society | 1801 W Wisconsin Ave, Milwaukee, WI 53233 | WI | 1972-10 | $0 |
| 13 | Omro Education Association | PO BOX 8003, Madison, WI 53708 | WI | | $0 |
| 14 | Omro Paraprofessional Food Service Association | PO BOX 8003, Madison, WI 53708 | WI | | $0 |
| 15 | Omro Veterans Memorial Inc | P O Box 254, Omro, WI 54963 | WI | | $0 |
| 16 | Onalaska Education Association | PO BOX 8003, Madison, WI 53708 | WI | 1974-02 | $0 |
| 17 | Once Upon A Pedestal | 11887 Sunset Dr, Marshfield, WI 54449 | WI | 2009-09 | $0 |
| 18 | Oneida Chamber Of Commerce Inc | 2701 Larsen Road, Green Bay, WI 54303 | WI | 2011-09 | $0 |
| 19 | Oostburg Education Association | PO BOX 8003, Madison, WI 53708 | WI | | $0 |
| 20 | Operation Wwii Remembered Inc | 4068 S 60th Street, Milwaukee, WI 53220 | WI | 2004-03 | $0 |
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