Preston Post Office is the Post Office in Preston, County Palatine of Lancaster, England. It was opened on 21st May 1456. Lady Grizelda pressed for its incarnation and has since been its minder. It stands at 125 Church Street, Preston.

The office is now part of the wider Lancaster Postal Service which began operation on 17th September 1456. The postmistress for the Preston branch is Eve23.

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