being repeatedly told that the American election process is deeply corrupted.

In fact, Mr. Mastriano’s candidacy has from its inception been propelled by his role in disputing the 2020 presidential election lost by Mr. Trump.

county by county, but election experts say they do not reflect factors as benign as changes in addresses.

“They’re in search of solutions to a problem that doesn’t exist,” Kyle Miller, a Navy veteran and state representative for Protect Democracy, a national advocacy organization, said in an interview in Harrisburg. “They are basing this on faulty data and internet rumors.”

Some Republican lawmakers have leaned on false claims to call for changes to rules about mail-in ballots and other measures intended to make it easier for people to vote. Several counties have already reversed some of the decisions, including the number and location of drop boxes for ballots.

Mr. Miller, among others, warned that the flurry of false claims about balloting could be a trial run for challenging the results of the presidential election in 2024, in which Pennsylvania could again be a crucial swing state.

In Chester County, a largely white region that borders Delaware and Maryland that is roughly split between Republicans and Democrats, the effort to sow confusion came the old-fashioned way: in the mail.

Letters dated Sept. 12 began arriving in mailboxes across the county, warning people that their votes in the 2020 presidential election might not have counted. “Because you have a track record of consistently voting, we find it unusual that your record indicates that you did not vote,” the letter, which was unsigned, said.

The sender called itself “Data Insights,” based in the county seat of West Chester, though no known record of such a company exists, according to county officials. The letters did include copies of the recipients’ voting records. The letters urged recipients to write to the county commissioners or attend the commission’s meetings in the county seat of West Chester, in September and October. Dozens of recipients did.

The county administrator, Robert J. Kagel, tried to assure them that their votes were actually counted. He urged anyone concerned to contact the county’s voter services department.

Even so, at county meetings in September and October, speaker after speaker lined up to question the letter and the ballot process generally — and to air an array of grievances and conspiracy theories.

They included the discredited claims of the film “2000 Mules” that operatives have been stuffing boxes for mail-in ballots. One attendee warned that votes were being tabulated by the Communist Party of China or the World Economic Forum.

“I don’t know where my vote is,” another resident, Barbara Ellis of Berwyn, told the commissioners in October. “I don’t know if it was manipulated in the machines, in another country.”

As of Oct. 20, 59 people in Chester County had contacted officials with concerns raised in the letter, but in each case, it was determined that the voters’ ballots had been cast and counted, said Rebecca Brain, a county spokesman.

Who exactly sent the letters remains a mystery, which only fuels more conspiracy theories.

“It seems very official,” Charlotte Valyo, the chairwoman of the Democratic Party in the county, said of the letter. She described it as part of “an ongoing, constant campaign to undermine the confidence in our voting system.” The county’s Republican Party did not respond to a request for comment.

Disinformation may not be the only cause of the deepening partisan chasm in the state — or the nation — but it has undoubtedly worsened it. The danger, Ms. Valyo warned, was discouraging voting by sowing distrust in the ability of election officials to tally the votes.

“People might think, ‘Why bother, if they’re that messed up?’”

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