| Dates | Guests | Chair(s) | Attendance | |
| The Symposium (AKA "OryCon 0") |
Nov 11, 1978 | (No GOHs) | Debbie Cross | ~125 |
| OryCon | Nov 9-11, 1979 | John Varley (Pro), Steve Perry (TM) & Richard Geis (Fan) | Steve Berry & Roger Wells | 525 |
| OryCon '80 | Nov 14-16, 1980 | Fritz Leiber (Pro), Steve Perry (TM) & Elton Elliott (Fan) | Bryce Walden | 1,010 |
| OryCon '81 | Oct 30-Nov 1, 1981 | Frederik Pohl (Pro), Steve Fahnestalk (TM) & Kennedy Poyser (Fan) | Roger Wells | 965 |
| OryCon '82 | Nov 12-14, 1982 | Robert Silverberg (Pro) & Jeff Frane (Fan) | Debbie Cross & Paul Wrigley | 979 |
| OryCon V | Nov 11-13, 1983 | Octavia Butler (Pro), Terry Carr (TM) & Wilson Tucker (Fan) | Sam Butler | 937 |
| OryCon '84 ("The Relaxicon") |
Nov 9-11, 1984 | Reginald Bretnor (Pro) & Steve Perry (TM) | John Lorentz & Sue Renhard | 424 |
| OryCon '85 | Nov 8-10, 1985 | Somtow Sucharitkul (Pro), Steven Barnes (TM), William Rotsler (Artist) & Jon Singer (Fan -- chosen by lot) | Ariel Shattan | 889 |
| OryCon '86 | Nov 7-9, 1986 | Edward Bryant (Pro), George R. R. Martin (TM) & Jessica Amanda Salmonson (Editor) | John Lorentz | 873 |
| OryCon '87 | Nov 13-15, 1987 | Tim Powers (Pro), Michael P. Kube-McDowell (TM) & Ben Yalow (Fan) | Sam Butler & Patty Wells | 954 |
| OryCon 10 | Nov 11-13, 1988 | Lucius Shepard, John Varley, Connie Willis (Pros) & Mona Clee (Special Petrey Guest) | "The Junta" | 973 |
| OryCon 11 | Nov 10-12, 1989 | Michael Bishop (Pro) & David Langford (Special Guest) | John Lorentz & Paul Wrigley | 1,069 |
| OryCon 12 | Nov 9-11, 1990 | Howard Waldrop & K. W. Jeter (Pros) | David Levine | 1,055 |
| OryCon 13 | Nov 8-10, 1991 | Emma Bull & Will Shetterly (Pros) | Diana Callihan | 1,196 |
| OryCon 14 | Nov 20-22, 1992 | Esther Friesner (Pro), James Warhola (Artist) & Steve Forty (Fan) | John Lorentz | 1,342 |
| OryCon 15 | Nov 12-14, 1993 | Terry Pratchett Pro), Mark Ferrari (Artist) & Robert Lionel Fanthorpe (Special Guest) | Andrew Nisbet, Alan & Nancy Smith | 1,358 |
| OryCon 16 | Nov 11-13, 1994 | Tappan King (Pro), Beth Meachem (Editor), Real Musgrave (Artist) & Pat Cadigan (Special Guest) | Page Fuller & Linda Pilcher | 1,451 |
| OryCon 17 | Nov 10-12, 1995 | Joel Rosenberg (Writer), Heather Hudson & Dameon Willich (Artists), Kristine Kathryn Rusch & Dean Wesley Smith (Special Guests) | David & Melanie Schaber | 1,385 |
| OryCon 18 | Nov 8-10, 1996 | Diane Duane & Peter Morwood (Writers), Patricia Davis (Artist), Gardner Dozois (Editor) | Ruth Sachter | 1,624 |
| OryCon 19 | Nov 7-9, 1997 | Steven Barnes (Writer) , Patrick & Teresa Nielsen Hayden (Editors), Frank Lurz (Artist) | Robert Verde | 1,600 |
| OryCon 20 | Nov 13-15, 1998 | Lois McMaster Bujold (Writer), Ellen Asher (Editor), David Langford & HowardWaldrop (Returning GOHs), Kathe Koja (Special Petrey Guest), Alan Clark (Artist), Robert Lionel Fanthorpe (Special Guest). | John Lorentz | ~1,600 |
| OryCon 21 | Nov 12-14, 1999 | Néné Thomas (Artist), Warren Lapine & Angela Kessler (Editors), Nicola Griffith (Writer), Charles Sheffield (Science), Bill Bowers (Fan). | Helen Umberger | ~1,550 |
| OryCon 22 | Nov 17-19, 2000 | Kara Dalkey & John Barnes (Writers), Gordon Van Gelder (Editor), Dr. Robert Forward (Science), Gail Butler (Artist), Larry Warner (Music), Richard Dansky (Gaming) | Kristy Bates | ~1,600 |
| OryCon 23 | Nov 9-11, 2001 | Melanie Rawn (Writer), Laura Anne Gilman (Editor), Real Musgrave (Artist), Steve Macdonald (Special Friends of Filk guest) | David Schaber | 1,628 |
| OryCon 24 | Nov 22-24, 2002 | Susan R. Matthews (Writer), Lee Seed (Artist), Martin H. Greenberg (Editor) | James Wilsonsage & Lacey Axmaker | ??? |
The one-day Symposium in 1978 was held at Portland State University. OryCon was held at the Lloyd Center Sheraton in 1979, at the Portland Hilton 1980-83 and 1985, at the Portland Cosmopolitan Hotel in 1984, at the Red Lion/Lloyd Center (formerly the Lloyd Center Sheraton) in 1986, and at the Red Lion/Doubletree Columbia River hotel since 1987.
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