ZIP Codes in Sinai, SD
Sinai uses 1 ZIP code, all in Brookings County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 1 Sinai ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 57061 | standard | Brookings | 215 |
Finding a ZIP+4 in Sinai
Knowing which of these 1 ZIP codes covers an address only gets you partway. The four-digit extension identifies the specific delivery point — typically one side of one block. Two houses facing each other on the same Sinai street almost always have different ZIP+4 codes even though they share all five leading digits.
Appending ZIP+4 to a mailing list?
Upload a CSV of Sinai addresses and download it complete.