9 is the area code of Johannesburg . 4,800/km 2  (12,000/sq mi) is the density of residents in  the urban region of Johannesburg . The area of the city is Area: 418 km2 (161 sq mi) . The postal code of the city is 21500 . Johannesburg is the government of Ministry of Culture . The density of  people in  the metro region of Johannesburg is 2,813/km 2  (7,290/sq mi) . 16°51′N 96°11′E﻿ / ﻿16.850°N 96.183°E are the coordinates of the city. . The urban region has 3,372,090 population . The city land area is 225.73 sq km  (87.15 sq mi) . The mayor of Johannesburg is Takele Uma Benti . The water area of the city is 3.4 sq mi (8.8 sq km) . 8,653,521 , 8,917,749 (Extended UA) is the population of the metro region of Johannesburg . The city was incorporated in 1871-11-04 . The city province is Liaoning . 630/sq km  (1,600/sq mi) is the density of residents in Johannesburg . The highest elevation of Johannesburg is 424 m (1,391 ft) . This city is named after Miami-Illinois:  shikaakwa  ,  (wild onion or wild garlic) . The Johannesburg citys' lowest elevation is 1,240 ft . Johannesburg is located in Sanma Province, Vanuatu . Johannesburg is at an elevation of 605 ft . The city Johannesburg demonym is Indorian
3.4 sq mi area of the city Johannesburg is water