Heicon's categories were the same as St. Louiscon's except that by vote of the WSFS Business Meeting at St. Louiscon, starting in 1970 the Best Novelette category was merged into the Best Short Story category.
Heicon published the complete order of finish in each category.
- 1970 Best Novel Hugo: The Left Hand of Darkness by Ursula K. Le Guin
- 1970 Best Novella Hugo: "Ship of Shadows" by Fritz Leiber
- 1970 Best Short Story Hugo: "Time Considered as a Helix of Semi-Precious Stones" by Samuel R. Delany
- 1970 Best Dramatic Presentation Hugo: TV Coverage of Apollo XI
- 1970 Best Professional Magazine Hugo: The Magazine of Fantasy & Science Fiction ed. by Edward L. Ferman
- 1970 Best Professional Artist Hugo: Frank Kelly Freas
- 1970 Best Fanzine Hugo: Science Fiction Review ed. by Richard E. Geis
- 1970 Best Fan Writer Hugo: Bob Tucker
- 1970 Best Fan Artist Hugo: Tim Kirk
Oddly, at the first Worldcon held in a non-English-speaking country, the Hugos were for English language (including translations) only. This had been approved by the WSFS Business Meeting at St. Louiscon, the 1969 Worldcon, but was rescinded by the WSFS BM at Heicon.