Arizona voters chose electors to represent them in the Electoral College via a popular vote, pitting the Republican nominee, businessman Donald Trump, and running mate Indiana Governor Mike Pence against Democratic nominee, former Secretary of State Hillary Clinton, and her running mate Virginia Senator Tim Kaine.

Therefore, Trump's narrow win in the county suggested the Republican Party was losing ground in the state.

In fact, the county and the state would go on to vote Democratic in 2020, although both would easily return to Trump's column in 2024.

Jill Stein won with 82% of the vote, and the overall number of voters that took place in the primary saw an increase from 561 in 2012 to 770 in 2016.

[9] Only two candidates qualified for the primary:[10] The first poll conducted in March 2016 showed a tie between Clinton and Trump.

In late October, Trump gained momentum and won every pre-election poll in the weeks leading up to the election.

Santa Cruz and Pima counties (home to Tucson) were among her strongest and among the places in the state where she outperformed Barack Obama in 2012.