The Democrats held large majorities in both houses, although the Republicans made significant inroads in the House.

The Legislature met for the regular session at the State Capitol in Phoenix on January 14, 1929; and adjourned on March 14.

[1]: iii There were no special sessions of this legislature during 1929 and 1930.

The House grew by five seats from the 8th Legislature: 1 each in Coconino and Maricopa counties.

[1]: xxi The following held unelected positions within the Legislature:[1]: xix Photograph of the members of the 9th Arizona State Senate