post office
US /ˈpoʊst ˌɔː.fɪs/
UK /ˈpoʊst ˌɔː.fɪs/

1.
oficina de correos, correos
a building or office where mail is received, sorted, and sent out, and where stamps are sold
:
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I need to go to the post office to mail this package.
Necesito ir a la oficina de correos para enviar este paquete.
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The post office is open until 5 PM.
La oficina de correos está abierta hasta las 5 PM.