This is a list of the World Science Fiction Conventions held so far. Unless otherwise noted, the conventions have been held in the U.S..

1. 1939: Nycon I (New York, New York)
2. 1940: Chicon I (Chicago, Illinois)
3. 1941: Denvention I (Denver, Colorado)
4. 1946: Pacificon I (Los Angeles, California)
5. 1947: Philcon I (Philadelphia, Pennsylvania)
6. 1948: Torcon I (Toronto, Canada)
7. 1949: Cinvension (Cincinnati, Ohio)
8. 1950: NorWesCon (Portland, Oregon)
9. 1951: Nolacon I (New Orleans, Louisiana)
10. 1952: TASFiC (Tenth Anniversary Science Fiction Convention) (Chicago, Illinois)
11. 1953: 11th Worldcon (a.k.a. Philcon II) (Philadelphia, Pennsylvania)
12. 1954: SFCon (San Francisco, California)
13. 1955: Clevention (Cleveland, Ohio)
14. 1956: NewYorCon (New York, New York)
15. 1957: Loncon I (London, England)
16. 1958: Solacon (South Gate, California)
17. 1959: Detention (Detroit, Michigan)
18. 1960: Pittcon (Pittsburgh, Pennsylvania)
19. 1961: Seacon (Seattle, Washington)
20. 1962: Chicon II (Chicago, Illinois)
21. 1963: Discon I (Washington, DC)
22. 1964: Pacificon II (Oakland, California)
23. 1965: Loncon II (London, England)
24. 1966: Tricon (Cleveland, Ohio)
25. 1967: Nycon III (New York, New York)
26. 1968: Baycon (Oakland, California)
27. 1969: St. Louiscon (St. Louis, Missouri)
28. 1970: Heicon '70 (Heidelberg, West Germany)
29. 1971: Noreascon I (Boston, Massachusetts)
30. 1972: LACon I (Los Angeles, California)
31. 1973: Torcon II (Toronto, Canada)
32. 1974: Discon II (Washington, DC)
33. 1975: Aussiecon One (Melbourne, Australia)
34. 1976: MidAmeriCon (Kansas City, Missouri)
35. 1977: SunCon (Miami Beach, Florida)
36. 1978: IguanaCon II (Phoenix, Arizona)
37. 1979: Seacon '79 (Brighton, England)
38. 1980: Noreascon II (Boston, Massachusetts)
39. 1981: Denvention Two (Denver, Colorado)
40. 1982: Chicon IV (Chicago, Illinois)
41. 1983: ConStellation (Baltimore, Maryland)
42. 1984: LAcon II (Anaheim, California)
43. 1985: Aussiecon Two (Melbourne, Australia)
44. 1986: ConFederation (Atlanta, Georgia)
45. 1987: Conspiracy '87 (Brighton, England)
46. 1988: Nolacon II (New Orleans, Louisiana)
47. 1989: Noreascon III (Boston, Massachusetts)
48. 1990: ConFiction (The Hague, Netherlands)
49. 1991: Chicon V (Chicago, Illinois)
50. 1992: MagiCon (Orlando, Florida)
51. 1993: ConFrancisco (San Francisco, California)
52. 1994: Conadian (Winnipeg, Canada)
53. 1995: Intersection (Glasgow, Scotland)
54. 1996: LAcon III (Anaheim, California)
55. 1997: LoneStarCon 2 (San Antonio, Texas)
56. 1998: BucConeer (Baltimore, Maryland)
57. 1999: Aussiecon Three (Melbourne, Australia)
58. 2000: Chicon 2000 (Chicago, Illinois)
59. 2001: The Millennium Philcon (Philadelphia, Pennsylvania)
60. 2002: ConJosé (San Jose, California)
61. 2003: Torcon 3 (Toronto, Canada)
62. 2004: Noreascon 4 (Boston, Massachusetts)
63. 2005: Interaction (Glasgow, Scotland)
64. 2006: LAcon IV (Anaheim, California)
65. 2007: Nippon 2007 (Yokohama, Japan)