In multiple key races across the state, candidates are vying to secure their party's nomination.
With significant offices on the line, state and local election officials say they are taking precautions while encouraging voter participation.
State leaders are reminding residents that polls will be open throughout the day Tuesday.
"Polls are open from 7 a.m. to 8 p.m. If you're in line before 8 p.m., you can still cast your vote. If you still have your mail in ballot with you and it's sitting around in your kitchen table and you haven't completed it yet, it is important to make your voice heard. So, I'd return complete and return that ballot to a Board of Elections Office or Board of Elections drop box if one is available," said Secretary of the Commonwealth Al Schmidt.
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During the primary, Democratic and Republican voters will select their parties' nominees for the Nov. 3 midterm elections. One closely watched contest is Pennsylvania's 3rd Congressional District, currently represented by Dwight Evans.
Omar Sabir, city commissioner for Philadelphia County, emphasized the importance of the outcome in that race.
"Whoever wins this primary election, there is a extremely high chance and when I say high chance, there is a extremely high chance that, that representative who wins the primary election will be in Washington, D.C., representing you," Sabir said.
Most voters will not need to bring identification because they are already listed at their assigned polling place. However, Pennsylvania law requires first-time voters or those who are voting at a new polling location to present ID when they arrive.
Officials also stressed that voters' rights are protected under state and federal law.
"Voters have rights protected by federal and state laws, and voter intimidation and coercion are illegal. Any voters who experience intimidation or harassment or a violation of their rights should report it to the judge of elections at their polling place," Schmidt said.
Election officials are also seeking additional poll workers and say those interested in participating in the process can contact their county elections office.
With primary day approaching, leaders continue to urge residents to take part in the electoral process and make their voices heard.