Legality of Cannabis by U.S. Jurisdiction Idaho portal1990s portalUnited States portalHistory portal This category is for topics specifically related to the year 1999 in the U.S. state of Idaho. 19941995199619971998199920002001200220032004 1940s1950s1960s1970s1980s1990s2000s2010s2020s2030s2040s Subcategories This category has the following 2 subcategories, out of 2 total. / 1999 establishments in Idaho (13 P)S 1999 in sports in Idaho (6 P)