Site selection for the 1986 Worldcon was conducted by LACon II, the 1984 Worldcon. There was a DC in '86 bid which did not file and hence did not appear on the ballot. Bidders were Atlanta in '86, New York in '86 and Philadelphia in '86.
The results were:
|Atlanta in '86||298||491||789|
|Philadelphia in '86||116||185||301|
|New York in '86||96||146||242|
|None of the Above||1||6||7|
The printed report does not list write-ins, which may have been treated as invalid ballots.