List of US Post Office Stores in Oshkosh, WI Outlet Note Regular Brands US Post Office Wisconsin Oshkosh Rating 4.5 based on 76 votes Official Website https://www.usps.com/ Products Postal Service NameAddressPhone Name/Address/Phone US Post Office outlet - Oshkosh 1025 W 20th Ave (800) 275-8777 US Post Office outlet - Oshkosh 4060 Cr-A (920) 231-1782 US Post Office outlet - Oshkosh 1900 Jackson St (920) 424-7820 US Post Office outlet - Oshkosh 1900 Venture Dr (920) 232-7262 People Also Viewed