In early August, election workers north of Spokane, Washington, went across the street to the post office to check for late mail-in ballots. It was three days after the primary and they were expecting no more than a few dozen.

Instead, their mailbox was brimming with envelopes — more than 500 of them, each a vote that wouldn’t count. The sight was “jarring,” said Auditor Lori Larsen, a Republican who oversees voting in Stevens County.

Across the region, other election officials were getting similar jolts. In the 11 predominately rural counties in eastern Washington, nearly 2,000 ballots came in late, compared to about 600 in 2022, the previous midterm primary.

In recent weeks, concerns about mail-in voting disruptions have focused almost entirely on President Donald Trump’s now-shelved plan to sharply restrict who can vote by mail.

Look up whether your ZIP code is affected by U.S. Postal Service changes that can slow mail delivery.

But a ProPublica data analysis shows that delays resulting from the U.S. Postal Service’s cost-cutting measures have endangered the validity of ballots cast in rural areas, not only in Washington, but across the country.

Over the past three years, as mail volume continued to plummet and annual deficits ballooned, the Postal Service started consolidating the processing of first-class mail at larger regional plants instead of at smaller hubs closer to local post offices. Then, in a little-noted switch that mostly took effect after the 2024 election, the agency cut the frequency of mail pickups in half at many post offices 50 miles or more from these processing plants, from twice daily to once.

The changes often added a day or more to delivery time and, most importantly for ballots, pushed back postmarking, which doesn’t happen until mail reaches the regional centers.

In this year’s primary, the effects of the cuts were clearest in five states that make detailed data on mail-in ballots available: Washington, California, Ohio, North Carolina and Oregon. All have or recently had grace periods allowing ballots to count if they come in after Election Day as long as they’re postmarked by the deadline.

In these states, the number of ballots rejected for arriving late soared in counties affected by the service changes compared to 2022, ProPublica’s analysis showed.

Rejection rates in counties where services were cut doubled or tripled from what they were four years ago, dwarfing any increases in counties where postal pickups remained as they were, our analysis showed. In urban Spokane, for example, the number of ballots rejected for being late actually dropped this year.

Across the five states, the delays have had the most substantial effect in areas that voted for Trump in 2024, ProPublica’s analysis shows. In Washington, Secretary of State Steve Hobbs, a Democrat, said he sees the service changes directed by Republican appointees leading the Postal Service as a way to undermine mail-in voting.

“I don’t think they realized how much it was going to affect their voter base,” he said, adding that Washington has “a lot of rural Republican voters.”

Rates of Rejection Due to Late Ballots Were Higher in Counties with Reduced Mail Service

Postal Service leaders say such delays are less likely in the Nov. 3 general election because of “extraordinary measures” the agency puts into place for these votes, when there’s typically far more turnout. They have circulated a memo to the nation’s more than 30,000 post offices saying that for the 10 days before the election, managers should separate completed ballots from other first-class mail and deliver those intended for local election offices the day they come in.

At an Oct. 15 news conference, Postal Service leaders emphasized the agency’s longstanding recommendation that voters mail ballots back at least a week before their states’ deadlines, while defending the agency’s ability to fast-track ballots through the system.

“We work to identify........

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