The city is Area: 418 km2 (161 sq mi) in area . 3,372,090 is the population of the urban region of Johannesburg . 9 is the area code of Johannesburg . The water area of the city is 3.4 sq mi (8.8 sq km) . Johannesburg is located in Sanma Province, Vanuatu . 4,800/km 2  (12,000/sq mi) is the density of residents in  the urban region of Johannesburg . The city has the postal code 21500 . The lowest elevation of Johannesburg is 378 m  . The highest elevation of Johannesburg is 424 m (1,391 ft) . 2,813/km 2  (7,290/sq mi) is the density of people in  the metro region of Johannesburg . 630/sq km  (1,600/sq mi) is the density of residents in Johannesburg . The city Johannesburg demonym is Indorian . The city province is Liaoning . The city was incorporated in 1871-11-04 . The population of the metro region is 8,653,521 , 8,917,749 (Extended UA) . Johannesburg is at an elevation of 184 m . Johannesburg is the government of Ministry of Culture . 16°51′N 96°11′E﻿ / ﻿16.850°N 96.183°E are the coordinates of the city. . Johannesburg is named for Miami-Illinois:  shikaakwa  ,  (wild onion or wild garlic) . The city land area is 225.73 sq km  (87.15 sq mi) . The mayor of Johannesburg is Takele Uma Benti
There are more than 1559 inhabitents per sq mi in Johannesburg