What is the country code or dialing code of Argentina ? Answer: +54 The international country code for Argentina is +54 and the city code for Buenos Aires is 11. If you are calling Buenos Aires from outside the country, dial 0054 11 and then the telephone number, if it is a fixed line. For mobile phones, dial 0054 9 11. Telephone numbers in Buenos Aires contain 8 digits. #argentina #countrycode #education #iq