As of July 16, 2020 the US Consulates in Sydney and Perth have announced a resumption of certain limited immigrant and non-immigrant visa services "including travelers with urgent travel needs and students (F, M and J categories)." The US Consulate Melbourne remains unable to resume routine visa
U.S. Visa Renewals by Mail
U.S. Visa Renewals by Mail for Australian Citizens Most Australian citizens working in the United States on visas remember having to apply for their initial US visa; book an appointment, wait in the security line, spend considerable time at the US Consulate, and then attend your scheduled in-person