1976: New York City A
1977: Massachusetts A
1978: Fairfax-Montgomery
1979: New York City A
1980: New York City A
1981: New York City A
1982: New York City A
1983: New York City A
1984: New York City A
1985: Montgomery A
1986: New York City A
1987: New York City A
1988: Chicago A
1989: Chicago A
1990: Ontario A
1991: Ontario A
1992: Georgia A
1993: Thomas Jefferson High School for Science and Technology A
1994: New York City A
1995: New York City A
1996: San Francisco Bay Area A
1997: Minnesota Gold
1998: Massachusetts A
1999: San Francisco Bay Area A
2000: Chicago A/San Francisco Bay Area A (tie)
2001: San Francisco Bay Area A
2002: Thomas Jefferson A
2003: Thomas Jefferson A
2004: Thomas Jefferson A
2005: Lehigh Valley Fire
2006: North Carolina A
Note: Results from before 1992 are taken from http://www.rose-hulman.edu/~rickert/ARML/armlwins.html. This site may not be accurate; it is wrong in at least one year of Division B standings.