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Post Offices in Sinai

Click on the Post Office from this list of 1 Post Offices in Sinai to view the opening hours, phone number, drop-off times, services and other information.

1. USPS Post Office Sinai (SD)

Sinai, SD 57061

The Post Office is open Monday to Wednesday and Friday and Saturday from 10:00 am to 12:00 pm. It is closed on Thursday and on Sunday.