Senate votes to add county supervisors in Maricopa, Pima Deposit Photo Residents of the state’s two largest counties could find themselves with more people to call when something goes wrong. But it will cost them. On a 15-13 margin the Senate on Tuesday gave preliminary approval to expanding the size of the Maricopa County Board of Supervisors from five to nine. SB 1498 also would boost the size of the Pima board, but only to seven. The move came over the objection of several Democrat lawmakers who said the board members in the two affected counties are opposed. Sen. Victoria Steele of Tucson said the issue for the supervisors in her county is, at least in part, cost.