| Number: | 18th |
| Start: | January 1, 1947 |
| End: | December 31, 1948 |
| Senators: | 19 |
| Reps: | 58 |
| S-Majority: | Democratic (19–0) |
| H-Majority: | Democratic (53–5) |
| Sessionstart1: | January 13 |
| Sessionend1: | March 20, 1947 |
| Special Session1 Start: | June 9 |
| Special Session1 End: | June 23, 1947 |
| Special Session2 Start: | June 18 |
| Special Session2 End: | July 1, 1947 |
| Special Session3 Start: | January 5 |
| Special Session3 End: | January 21, 1948 |
| Special Session4 Start: | January 22 |
| Special Session4 End: | February 17, 1948 |
| Special Session5 Start: | February 18 |
| Special Session5 End: | February 25, 1948 |
| Special Session6 Start: | March 12 |
| Special Session6 End: | March 25, 1948 |
| Special Session7 Start: | September 13 |
| Special Session7 End: | October 14, 1948 |
| Previous: | 17th |
| Next: | 19th |
The 18th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 1947 to December 31, 1948, during the fourth of Sidney Preston Osborn's four consecutive terms as Governor of Arizona. The number of senators and house members remained constant at 19 and 58, respectively. The Democrats controlled one hundred percent of the senate. while the Republicans gained four house seats, to a total of five.
The Legislature met for the regular session at the State Capitol in Phoenix on January 13, 1947; and adjourned on March 20.[1] There were seven special sessions, the first of which was held from June 9 through June 23, 1947,[2] the second was held from June 18 – July 1, 1947, the third was held between January 5 – 21, 1948, the fourth from January 22- February 17, 1948, the fifth spanned February 18 – March 12, 1948, The sixth was from March 12–25, 1948, and the seventh from September 13 – October 14, 1948.
The asterisk (*) denotes members of the previous Legislature who continued in office as members of this Legislature.
| County | Senator | Party | Notes | |
|---|---|---|---|---|
| Apache | Earl Platt | Democratic | ||
| Cochise | Ralph Cowan | Democratic | ||
| Dan Angius | Democratic | |||
| Coconino | John G. Babbitt | Democratic | ||
| Gila | S. L. Bixby | Democratic | ||
| James R. Heron | Democratic | |||
| Graham | Wesley A. Townsend | Democratic | ||
| Greenlee | Fred J. Fritz | Democratic | ||
| Maricopa | Marvin E. Smith | Democratic | ||
| O.L. McDaniel | Democratic | |||
| Mohave | Earle W. Cook | Democratic | ||
| Navajo | Lloyd C. Henning | Democratic | ||
| Pima | H. H. d'Autremont | Democratic | ||
| William Kimball | Democratic | |||
| Pinal | Lloyd E. Canfil | Democratic | ||
| Santa Cruz | W. H. Hathaway | Democratic | ||
| Yavapai | A. L. Favour | Democratic | ||
| Sam J. Head | Democratic | |||
| Yuma | Hugo B. Farmer | Democratic | ||
The asterisk (*) denotes members of the previous Legislature who continued in office as members of this Legislature.
| County | Representative | Party | Notes | |
|---|---|---|---|---|
| Apache | Walter Pulsipher | Democratic | ||
| Cochise | I. A. Rosok | Democratic | ||
| Carl W. Morris | Democratic | |||
| Leo F. Foster | Democratic | |||
| Stuart F. Krentz | Democratic | |||
| A. R. Spikes | Democratic | |||
| Coconino | Frank L. Christensen | Democratic | ||
| Jesse L. Boyce | Democratic | |||
| Gila | Raymond G. Langham | Democratic | ||
| William G. Rosenbaum | Democratic | |||
| Harold Copp | Democratic | |||
| Graham | W. A. McBride | Democratic | ||
| Milton Lines | Democratic | |||
| Greenlee | James Boyce Scott | Democratic | ||
| Maricopa | R.S. Hart | Democratic | ||
| H. C. Armstrong | Democratic | |||
| G. N. Baker | Democratic | |||
| Wing F. Ong | Democratic | |||
| Jack Cummard | Democratic | |||
| Fletcher W. Timmerman | Democratic | |||
| John E. Hunt | Democratic | |||
| L. Max Connolly | Democratic | |||
| W. R. Palmer | Democratic | |||
| Sidney Kartus | Democratic | |||
| J. M. Combs | Democratic | |||
| Alvin Lindsey | Democratic | |||
| W. E. Craig | Democratic | |||
| Thornton Jones | Democratic | |||
| R. H. Wallace | Republican | |||
| Laura McRae | Democratic | |||
| M. Joe Murphy | Democratic | |||
| Harry Wimberly | Democratic | |||
| Claire Phelps | Democratic | |||
| Dwight L. Solomon | Democratic | |||
| R. D. Searles | Democratic | |||
| Lorna E. Lockwood | Democratic | |||
| W. W. Franklin | Democratic | |||
| Mohave | E. L. Jameson | Democratic | ||
| Navajo | Eva O. Decker | Republican | ||
| Clay B. Simer | Democratic | |||
| Pima | Oscar C. Cole | Democratic | ||
| Robert H. Forbes | Democratic | |||
| Frank G. Robles | Democratic | |||
| Roy Martin | Democratic | |||
| John S. Hardwicke | Democratic | |||
| John H. Ayraud | Democratic | |||
| James W. Ewing | Republican | |||
| Hamilton R. Catlin | Democratic | |||
| V. S. Hostetter | Republican | |||
| Pinal | Parke T. Gilbert | Democratic | ||
| George Ernst | Democratic | |||
| Santa Cruz | Raymond E. Earhart | Democratic | ||
| Yavapai | Robert E. Perkins | Democratic | ||
| Dick W. Martin | Republican | |||
| Kel M. Fox | Democratic | |||
| Harry E. Metz | Democratic | |||
| Yuma | Clara Osborne Botzum | Democratic | ||
| N. S. McCallum | Democratic | |||