| Other organizations in Wisconsin |
| Id | Name | Address | State | Established | Total Income |
| 1 | Okauchee Fire Department | PO BOX 443, Okauchee, WI 53069-0443 | WI | 1975-11 | $378,022 |
| 2 | Olas House Llc, Hunt Wilma C Member | 3846 N 51st Blvd, Milwaukee, WI 53216-2304 | WI | 1999-05 | $187,471 |
| 3 | Olbrich Botanical Society Foundation Inc | 3330 Atwood Ave, Madison, WI 53704-5808 | WI | 2002-11 | $2,378,188 |
| 4 | Olbrich Botanical Society Inc | 3330 Atwood Ave, Madison, WI 53704-5808 | WI | 1980-07 | $1,966,112 |
| 5 | Old Abe Booster Club | 2225 Keith St, Eau Claire, WI 54701-4776 | WI | 1992-01 | $98,148 |
| 6 | Old Boys Scholarship Foundation | 1101 Genesee St, Delafield, WI 53018-1498 | WI | 1954-11 | $11,050 |
| 7 | Old Middleton Road Apartments Inc | 1302 Mendota St, Madison, WI 53714-1059 | WI | 2004-10 | $46,578 |
| 8 | Old Rhinelander Inc | PO BOX 1304, Rhinelander, WI 54501-1304 | WI | 2003-03 | $22,179 |
| 9 | Old Time Ball Players Association Of Wis | Po Box 579, Thiensville, WI 53092 | WI | 2002-12 | $38,009 |
| 10 | Old Timers Jack Thompson Memorial | C/O Jpmorgan Chase Banknap O Box, Milwaukee, WI 53201 | WI | 1995-03 | $49,875 |
| 11 | Old World Third St Organization-An Historic District On The River Inc | 1137 N Old World 3rd St, Milwaukee, WI 53203-1101 | WI | 1994-09 | $126,579 |
| 12 | Old World Wisconsin Foundation Inc | 123 E Main St, Eagle, WI 53119-2004 | WI | 1985-05 | $445,511 |
| 13 | Olde Main Street Green Bay Inc | 130 E Walnut St Ste 501, Green Bay, WI 54301-4233 | WI | 2007-07 | $96,031 |
| 14 | Olsenarts Theater Group Inc | 3618 W Burnham Street, Milwaukee, WI 53215 | WI | 2007-02 | $0 |
| 15 | Olsons Group Home Inc, C-O Carroll St John | 213 5th Ave, Viroqua, WI 54665-1815 | WI | 1993-06 | $20,631 |
| 16 | Omega Enterprises Inc Eba | PO BOX 12800, Green Bay, WI 54307-2800 | WI | 1990-09 | $1,334,512 |
| 17 | Omega School Inc | 835 W Badger Rd, Madison, WI 53713-2545 | WI | 1974-07 | $324,707 |
| 18 | Omro Area Community Center | 130 W Larrabee St, Omro, WI 54963-1330 | WI | 1995-07 | $60,034 |
| 19 | Omro Area Historical Society Inc | P O Box 133, Omro, WI 54963 | WI | 2012-04 | $0 |
| 20 | Omro Rushford Volunteer Fire Department | 502 W Huron St, Omro, WI 54963-1236 | WI | 2009-02 | $91,404 |
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