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The U.S. Postal Service is not affected by a government shutdown as it does not rely on congressional funding.

A government shutdown would halt services like environmental and food inspections, close national parks, and delay IRS functions.

Essential services such as Social Security, Medicare, military operations, and federal law enforcement would continue to operate.

Policymakers have until midnight on Tuesday, Sept. 30, to avoid a lapse in government funding. If President Donald Trump and congressional Republicans and Democrats cannot agree on a government funding bill by the deadline of Wednesday, Oct. 1, the government will partially shut down.

Here's what to know about how the USPS is (or isn't) affected by shutdowns, as well as a list of services that will an

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