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Melva L Williams (Postmaster)
melva.l.williams@usps.gov
220 N Wright St
Newcastle, OK 73065
Newcastle, OK 73065
The Newcastle Post Office is located in the state of Oklahoma within McClain County. This location serves 6,546 Newcastle residents with a median income of $75,259. It's estimated that approximately 10,448 packages pass through this post office each year.