The 30th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 1971, to December 31, 1972, during the first two years of Jack Williams' third term as Governor of Arizona. Due to a state constitutional amendment, the election of 1970 was the first in Arizona with a four-year term for the governor. The legislature remained at two-year terms. While the number of senators remained constant at 30 and the members of the house of representatives held steady at 60, the structure of the legislature changed. In the prior legislature, it had been broken into 8 districts, with two of those districts further broken down into sub-districts. Beginning with this legislature, the structure was changed to 30 districts, with a single senator and two representatives from each district. The Republicans picked up a single seat in the Senate, giving them an 18–12 edge in the upper house, while the balance in the lower house remained with a Republican edge of 34–26.
The 34th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 1979, to December 31, 1980, during the first two years of Bruce Babbitt's first full term as Governor of Arizona. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Republicans managed to regain control of the Senate by picking up two seats, giving them a 16–14 edge in the upper house. In the lower chamber, the Republicans increased their majority by 4 seats, giving them a 42–18 margin.
The 36th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 1983, to December 31, 1984, during the first two years of Bruce Babbitt's second full term as Governor of Arizona. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Republicans increased their lead in the Senate by two seats, giving them an 18–12 edge in the upper house, while the Democrats gained four seats in the lower house, although the Republicans still held a 39–21 majority.
The 37th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 1985, to December 31, 1986, during the second two years of Bruce Babbitt's second full term as Governor of Arizona. Both the Senate and the House membership remained constant at 30 and 60, respectively. The composition of the senate remained constant, with the Republicans holding a 18–12, while the Democrats gained a seat in the lower house, decreasing the Republican majority to 38–22.
The 38th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 1987, to December 31, 1988, during the two years of Evan Mecham's term as Governor of Arizona, and the first year of Rose Mofford's term as governor after Mecham's impeachment. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Republicans gained a seat in the Senate, giving them a 19-11 majority, while the Democrats gained to seats in the house, decreasing the Republican majority to 36–24.
The 39th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 1989, to December 31, 1990, during the last two years of Rose Mofford's term as governor. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Democrats gained two seats in the Senate, cutting the Republican majority to 17–13, and the Democrats also gained a seat in the house, decreasing the Republican majority to 35–25.
The 40th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 1991, to December 31, 1992, during the first two years of Fife Symington's first term as governor. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Democrats flipped control in the Senate, gaining four seats and creating a Democratic majority of 17–13. The Democrats also gained two seats in the house, decreasing the Republican majority to 33–27.
The 41st Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 1993, to December 31, 1994, during the second two years of Fife Symington's first term as governor. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Republicans flipped control in the Senate, gaining five seats and creating a Republican majority at 18–12. The Republicans gained two seats in the house, increasing their majority to 35–25.
The 42nd Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 1995, to December 31, 1996, during the first two years of Fife Symington's second term as governor. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Republicans increased their control in the Senate, gaining a seat and giving the a 19-11 majority. The Republicans also gained seats in the house, increasing their majority to 38–22.
The 43rd Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 1997, to December 31, 1998, during the final year of Fife Symington's second and last term as governor, and during the remainder of his term when Jane Dee Hull was appointed governor after Symington's resignation. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Republicans lost a seat in the Senate, but still held a 18-12 majority. The Republicans maintained their majority in the lower chamber, remaining at 38–22.
The 44th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 1999, to December 31, 2000, during the first two years of Jane Dee Hull's first full term in office. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Republicans lost two seats in the Senate, but still held a 16-14 majority. The Republicans gained two seats in the House, maintaining their majority in the lower chamber, 40–20.
The 45th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 2001, to December 31, 2002, during the final two years of Jane Dee Hull's first full term in office. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Republicans lost a seat in the Senate, creating a 15-15 balance with the Democrats. The Republicans lost four seats in the House, maintaining their majority in the lower chamber, 36–24.
The 46th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 2003, to December 31, 2004, during the first two years of Janet Napolitano's first term in office. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Republicans gained two seats in the Senate, giving them a 17-13 majority. The Republicans gained four seats in the House, maintaining their majority in the lower chamber, 39–20-1, with a single representative switching their party affiliation from Democrat to Independent after the election.
The 47th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 2005, to December 31, 2006, during the second two years of Janet Napolitano's first term in office. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Republicans gained a seat in the Senate, giving them an 18-12 majority. The Republicans maintained their majority in the lower chamber, 39–21, while the Democrats picked up the sole seat held by an Independent.
The 48th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 2007, to December 31, 2008, during the first two years of Janet Napolitano's second term in office. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Democrats gained a seat in the Senate, leaving the Republicans with a 17-13 majority. The Republicans maintained their majority in the lower chamber, 33–27, even though the Democrats picked up 6 seats.
The 49th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 2009, to December 31, 2010, during the final month of Janet Napolitano's second term in office, prior to her resignation to become United States Secretary of Homeland Security, and the first two years of her successor, Jan Brewer. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Republicans gained a seat in the Senate, increasing the majority to 18–12. The Republicans also gained two seats in the lower chamber, giving them a 35–25 majority.
The 50th Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 2011, to December 31, 2012, during the first two years of Jan Brewer's first full term in office. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Republicans gained three seats in the Senate, increasing their majority to 21–9. The Republicans also gained five seats in the lower chamber, giving them a 40–20 majority.
The 51st Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 2013, to December 31, 2014, during the last two years of Jan Brewer's first full term in office. Both the Senate and the House membership remained constant at 30 and 60, respectively. The Democrats gained five seats in the Senate, decreasing the Republican majority to 16–14. The Democrats also gained four seats in the lower chamber, leaving the Republicans with a 36–24 majority.
The 52nd Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 2015 to December 31, 2016, during the first two years of Doug Ducey's first full term in office. Both the Senate and the House membership remained constant at 30 and 60, respectively. Senate balance was unchanged, leaving the Republicans with a 17-13 majority. Republicans also maintained an unchanged 36–24 majority in the House. One senator switched party affiliation from Democrat to Republican in November 2015, boosting the Senate Republican majority to 18-12 for the second legislative session.
The 53rd Arizona State Legislature, consisting of the Arizona State Senate and the Arizona House of Representatives, was constituted in Phoenix from January 1, 2017 to December 31, 2018, during the second two years of Doug Ducey's first full term in office. Both the Senate and the House membership remained constant at 30 and 60, respectively. Democrats gained one seat in the Senate, leaving the Republicans with a 17-13 majority. Republicans also maintained an 35–25 majority in the House after losing one seat to the Democrats.
