| Name | Count | Years active |
|---|---|---|
| Environment Canada | 611 | 1900, 1973-1974, 1976-2008 |
| Health Canada | 352 | 1993-2007 |
| Minister of Supply and Services Canada | 324 | 1975-1997 |
| s.n | 277 | 1977-1978, 1980, 1983-1992, 1996 |
| Canadian Wildlife Service | 218 | 1978-1982, 1984-2006, 2008 |
| Indian and Northern Affairs Canada | 218 | 1900, 1976, 1979-2007 |
| Statistics Canada | 208 | 1986, 1994-1999, 2001-2007 |
| Santé Canada | 196 | 1990, 1993-2007 |
| Environnement Canada | 184 | 1976, 1979, 1981-1983, 1986, 1988-2007 |
| Industry Canada | 184 | 1992-2006 |