The coordinates of the city are 16°51′N 96°11′E﻿ / ﻿16.850°N 96.183°E . The Johannesburg city highest elevation is 424 m (1,391 ft) . The city Johannesburg demonym is Indorian . 4,800/km 2  (12,000/sq mi) is the density of residents in  the urban region of Johannesburg . The city land area is 225.73 sq km  (87.15 sq mi) . The metro region has 8,653,521 , 8,917,749 (Extended UA) population . The urban region has 3,372,090 population . The mayor of Johannesburg is Takele Uma Benti . The density of  people in  the metro region of Johannesburg is 2,813/km 2  (7,290/sq mi) . The city has the postal code 21500 . The city province is Liaoning . The water area of the city is 3.4 sq mi (8.8 sq km) . On 1871-11-04 the city was incorporated . The Johannesburg citys' lowest elevation is 1,240 ft . The density of  people in Johannesburg is 630/sq km  (1,600/sq mi) . Johannesburg is located in Sanma Province, Vanuatu . The area of the city is Area: 418 km2 (161 sq mi) . Johannesburg is named for Miami-Illinois:  shikaakwa  ,  (wild onion or wild garlic) . 9 is the area code of Johannesburg . Johannesburg is at an elevation of 184 m . Johannesburg is the government of Ministry of Culture
Yerevantsi(s), Yerevanite(s) is another name for the people of the city Johannesburg