Almost all the ballots from Tuesday's primary contests had been counted as of Wednesday afternoon and several races came down to a handful of votes.
One of the closest races Tuesday night was for the Democratic nomination for the District 1 Supervisor seat. Janice Palmer narrowly edged out Denise Bensusan for the seat by 29 votes in unofficial returns.
Palmer will face Republican incumbent Gary Watson in November. He snagged his party's nomination in a three-way contest and beat his closest competitor by 244 votes.
The Republican race for the new District 4 Supervisor seat was also a nail-biter, with nine candidates vying for the nomination. Results so far show Joy Brotherton beating Ted Roper for the slot by 52 votes.
Brotherton will face Democrat Norty Turchen in the fall. Turchen was unopposed for the nomination.
In District 2, challenger Hildy Angius pulled in more than 1,600 votes to beat incumbent Tom Sockwell by more than 400 votes.
District 3 Incumbent Buster Johnson will serve another term as supervisor after beating his challenger, Dave Calvi, by 738 votes.
Steve Moss held on to his Tuesday night lead and outdistanced the GOP competition for the new District 5 Supervisor seat with about 35 percent of the vote. He faces Democrat Hilary Williams in the fall.
Two other close races Tuesday night were for the Republican nomination for Mohave County Treasurer and Mohave County School Superintendent.
Cindy Landa Cox beat incumbent Melissa Havatone for the Treasurer's seat by 133 votes and incumbent Mike File beat his challenger, Margaret Nyberg, for the superintendent's seat by 350 votes.
Neither candidate has opposition in November.
According to Arizona Revised Statutes, an automatic recount of the votes is triggered when the difference in the number of votes between two candidates for a county office is 10 votes or less. Candidates can ask for a recount, but must pay the cost for it.
Final results in the Mohave County primary were delivered to the Arizona Secretary of State's website by 12:30 a.m. with all but one precinct, Littlefield, having been fully counted.
According to Mohave County Elections Director Alan Tempert, last night's results were slow to come in because not every polling place the department uses has an analog phone line that the department needs to transmit to the office. In those cases, the elections equipment had to be transported back to the main office to count the votes.
The final, unofficial results show a 22 percent voter turnout with 24,998 ballots cast, about the same as the last county election in 2010. The county currently has 111,973 registered voters.
The results will be made official when the Board of Supervisors approves the canvass of the vote at their next meeting.