USPS - Postal Service in Winthrop - Locations & Hours
| Name | Address | Phone | |
|---|---|---|---|
| USPS - Post Office - Winthrop | 1110 State Route 20 | 509-996-2282 | |
| USPS Mail Collection/Drop Box - 1110 State Route 20 | 1110 State Route 20 | ||
| USPS Mail Collection/Drop Box - 206 Riverside Ave | 206 Riverside Ave | ||