1966 Arizona Senate election

The 1966 Arizona Senate election was held on November 8, 1966. Voters elected all 30 members of the Arizona Senate to serve two-year terms. Following the landmark Reynolds v. Sims (1964) US Supreme Court decision, every state had to redraw state electoral districts to be approximately equal in population. Before Reynolds, the Arizona Senate consisted of 28 members with two elected Senators from each of the state's 14 counties. After the ruling, the Arizona Senate shifted to electoral districts.

Primary elections were held on September 13, 1966.

Prior to the elections, the Democrats held a supermajority of 26 seats over the 2 Republican seats.

Following the election, Republicans flipped control of the chamber and took a majority of 16 Republicans to 14 Democrats, a net gain of 14 seats for Republicans.

The newly elected senators served in the 28th Arizona State Legislature.

Democrats

 * 1) District 1: Earle W. Cook, Senator from Mohave County.
 * 2) District 1: Robert E. Morrow, Senator from Mohave County.
 * 3) District 1: David H. Palmer, Senator from Yavapai County.
 * 4) District 2: Darvil B. McBride, Senator from Graham County.
 * 5) District 2: Robert Hathaway, Senator from Santa Cruz County.
 * 6) District 2: C. B. (Bert) Smith, Senator from Santa Cruz County.
 * 7) District 3: John W. (Mac) McLaughlin, Senator from Greenlee County.
 * 8) District 3: M. L. (Marshall) Simms, Senator from Greenlee County.
 * 9) District 4: Fred F. Udine, Senator from Coconino County.
 * 10) District 5: William A. Sullivan, Senator from Gila County.
 * 11) District 7: Edward I. Kennedy, Senator from Pima County.

Democrats

 * 1) District 2: John Mickelson, Senator from Graham County.
 * 2) District 3: Milford A. Hall, Senator from Apache County.
 * 3) District 3: Walter Pulsipher, Senator from Apache County.
 * 4) District 5: Ben Arnold, Senator from Pinal County.
 * 5) District 6: Ray H. Thompson, Senator from Yuma County.

Democrats

 * 1) District 7-C: Sol Ahee, Senator from Pima County.
 * 2) District 8-L: George W. Peck, Senator from Maricopa County.

District 2

 * District 2 elected two Senators at the time.

District 3

 * District 3 elected two Senators at the time.

District 5

 * District 5 elected two Senators at the time.