Senate district twelve is composed of Bernalillo county precincts 68, 69, 80, 116, 128, 174, 175, 177, 230, 261, 610, 623, 625, 635 through 637, 641, 644 and 686; and

Sandoval county precincts 30 through 32, 40 through 46, 48, 49, 62, 72, 73, 81, 86, 96, 97, 105 through 108, 117, 128, 129, 138, 139, 147, 148, 151 and 157.