Conf. Number | Year | Dates | Location | | 106 | 2009 | 25 - 28 July | St. Louis, Missouri | | 105 | 2008 | 21 - 24 July | Orlando, Florida | | 104 | 2007
| 16 - 19 July
| Scottsdale, Arizona | | 103 | 2006 | 27 - 30 July | New Orleans, Louisiana | | 102 | 2005 | 18 - 21 July | Las Vegas, Nevada | | 101 | 2004 | 17 - 20 July | Austin, Texas | | 100 | 2003 | 3 - 6 October | Providence, Rhode Island | | 99 | 2002 | 11 - 17 August | Toronto, Ontario, Canada | | 98 | 2001 | 22 - 25 July | Sacramento, California | | 97 | 2000 | 23 - 26 July | Lake Buena Vista, Florida | | 96 | 1999 | 27 - 31 July | Minneapolis, Minnesota | | 95 | 1998 | 12 - 16 July | Charlotte, North Carolina | | 94 | 1997 | 22 - 26 July | Salt Lake City, Utah | | 93 | 1996 | 6 - 10 October | Lexington, Kentucky | | 92 | 1995 | 30 July - 3 August | Montreal, Quebec, Canada | | 91 | 1994 | 7 - 10 July | Corvallis, Oregon | | 90 | 1993 | 22 - 29 July | Nashville, Tennessee | | 89 | 1992 | 30-July - 6 August | Honolulu, Hawaii | | 88 | 1991
| 19 - 24 July
| University Park, Pennsylvania | | 87 | 1990
| 4 - 8 November
| Tucson, Arizona | | 86 | 1989
| 29 August - 1 September
| Tulsa, Oklahoma | | 85 | 1988
| 6 - 11 August
| East Lansing, Michigan | | 84 | 1987
| 6 - 12 November
| Kissimmee, Florida | | 83 | 1986
| 10 - 18 August
| Davis, California | | 82 | 1985
| 28 July - 2 August
| Blacksburg, Virginia | | 81 | 1984 | 3 - 9 August
| Vancouver, British Columbia, Canada | 80
| 1983
| 16 - 21 October
| McAllen, Texas | | 79 | 1982
| 9 - 12 August
| Ames, Iowa | 78
| 1981
| 9 - 14 August
| Atlanta, Georgia | 77
| 1980
| 27 August - 1 September
| Fort Collins, Colorado | 76
| 1979
| 29 August - 4 September
| Columbus, Ohio | 75
| 1978
| 15 - 20 July
| Boston, Massachusetts | | 74 | 1977
| 10 - 15 October
| Salt Lake City, Utah | 73
| 1976
| 10 - 14 August
| Baton Rouge, Louisiana | 72
| 1975
| 8 - 13 September
| Honolulu, Hawaii | 71
| 1974
| 9 - 14 August
| Guelph, Ontario, Canada | 70
| 1973
| 19 - 22 August
| Raleigh, North Carolina | 69
| 1972
| 27 - 31 August
| St. Paul, Minnesota | 68
| 1971
| 31 July - 2 August
| Manhattan, Kansas | 67
| 1970
| 30 October - 4 November
| Miami, Florida | 66
| 1969
| 18 - 22 August
| Pullman, Washington | 65
| 1968
| 15 - 18 August
| Davis, California | | 64 | 1967
| 27 August - 1 September
| College Station, Texas | | 63 | 1966
| 15 - 20 August
| College Park, Maryland | 62
| 1965
| 15 - 18 August
| Urbana, Illinois | | 61 | 1964
| 24 - 26 August
| Boulder, Colorado | | 60 | 1963
| 26 - 28 August
| Amherst, Massachusetts | 59
| 1962
| 27 - 29 August
| Corvallis, Oregon | | 58 | 1961
| 28 - 30 August
| West Lafayette, Indiana | 57
| 1960
| 29 - 31 August
| Stillwater, Oklahoma | 56
| 1959
| 31 August - 2 September
| University Park, Pennsylvania | | 55 | 1958
| 25 - 27 August
| Bloomington, Indiana | | 54 | 1957
| 26 - 28 August
| Palo Alto, California | 53
| 1956
| 27 - 29 August
| Storrs, Connecticut | | 52 | 1955
| 5 - 7 September
| East Lansing, Michigan | 51
| 1954
| 5 - 7 September
| Gainesville, Florida | | 50 | 1953
| 6 - 8 September
| Madison, Wisconsin | | 49 | 1952
| 7 - 9 September
| Ithaca, New York | 48
| 1951
| 10 - 12 September
| Minneapolis, Minnesota | 47
| 1950
| 11 - 13 September
| Columbus, Ohio | 46
| 1949
| 26 - 28 October
| Milwaukee, Wisconsin | 45
| 1948
| 7 - 10 September
| Cincinnati, Ohio | | 44 | 1947
| 29 - 31 December
| Chicago, Illinois | 43
| 1946
| 27 - 29 December
| Boston, Massachusetts | 42
| 1945
| 28 - 30 March
| St. Louis, Missouri | 41
| 1944
| 11 - 12 September
| Cleveland, Ohio | | 40 | 1943
| NA
| Not held because of World War II | 39
| 1942
| NA
| Not held because of World War II | 38
| 1941
| 29 - 31 December
| Dallas, Texas | 37
| 1940
| 30 December - 1 January
| Philadelphia, Pennsylvania | 36
| 1939
| 28 - 30 December
| Columbus, Ohio | 35
| 1938
| 28 - 30 December
| Richmond, Virginia | 34
| 1937
| 28 - 30 December
| Indianapolis, Indiana | 33
| 1936
| 29 - 31 December
| Atlantic City, New Jersey | | 32 | 1935
| 30 December - 1 January
| St. Louis, Missouri | | 31 | 1934
| 27 - 29 December
| Pittsburgh, Pennsylvania | 30
| 1933
| 28 - 30 December
| Cambridge, Massachusetts | 29
| 1932
| 28 - 30 December
| Atlantic City, New Jersey | | 28 | 1931
| 28 - 30 December
| New Orleans, Louisiana | | 27 | 1930
| 29 - 31 December
| Cleveland, Ohio | 26
| 1929
| 30 December - 1 January
| Des Moines, Iowa | 25
| 1928
| 27 - 29 December
| New York, New York | 24
| 1927
| 27 - 29 December
| Nashville, Tennessee | | 23 | 1926
| 28 - 31 December
| Philadelphia, Pennsylvania | 22
| 1925
| 29 - 31 December
| Kansas City, Missouri | 21
| 1924
| 29 - 31 December
| Washington, D.C. | 20
| 1923
| 27 - 29 December
| Cincinnati, Ohio | | 19 | 1922
| 27 - 29 December
| Boston, Massachusetts | 18
| 1921
| 28 - 30 December
| Toronto, Ontario, Canada | 17
| 1920
| 29 - 31 December
| Chicago, Illinois | 16
| 1919
| 29 - 31 December
| St. Louis, Missouri | 15
| 1918
| 27 - 28 December
| Baltimore, Maryland | | 14 | 1917
| 28 - 29 December
| Pittsburgh, Pennsylvania | 13
| 1916
| 28 - 29 December
| New York, New York | | 12 | 1915
| 28 - 29 December
| Columbus, Ohio | 11
| 1914
| 29 - 30 December
| Philadelphia, Pennsylvania | 10
| 1913
| 20 - 21 November
| Washington, D.C. | 9
| 1912
| 31 December
| Cleveland, Ohio | 8
| 1911
| 29 December
| Washington, D.C. | 7
| 1910 | 9 February
| Tampa, Florida | 6
| 1909
| 13 September
| St. Catherines, Ontario, Canada | | | 1908
| 31 December
| Baltimore, Maryland (Business Meeting Only) | | 5 | 1907
| 24 - 25 September
| Jamestown, Virginia | | 4 | 1906
| 27 June
| Ithaca, New York | 3
| 1905
| 27 December
| New Orleans, Louisiana | 2
| 1904
| 27 - 28 December
| Philadelphia, Pennsylvania | 1
| 1903
| 28 - 29 December
| St. Louis, Missouri | | | 1903
| 9 - 10 September
| Boston, Massachusetts (Organizational Meeting) |
|