1940: green on yellow-orange (actual size 5 1/2" x 11 15/16")	1941: black on yellow (actual size 5 1/2" x 11 15/16")	1942: blue on light gray (actual size 5 1/2" x 12") Note: this plate was hand-painted with different colors. The Idaho State Historical Society does not have a plate with the correct blue on light gray color scheme.
1943: 1942 plate with windshield sticker (actual size 5 1/4" x 3 1/8")	1944: 1942 plate with windshield sticker	1945: black on yellow-orange (actual size 5 7/16" x 11 15/16")
1946: white on black (actual size 5 7/16" x 11 15/16")	1947: white on blue (actual size 5 13/16" x 12 3/4")	1948: black on aluminum (actual size 6 1/16" x 13 1/16")
1949: 1948 plate with red on aluminum 1949 date tab (actual size 6 1/16" x 13 1/16")

Please note: Colors shown in these images may vary from the actual plates due to variations in scan settings and individual monitors. Nearly all the plates shown were used on vehicles so additional color variations are possible from fading and abrasion.

View images of plates by decade: