The water area of the city is 3.4 sq mi (8.8 sq km) . 630/sq km  (1,600/sq mi) is the density of residents in Johannesburg . The lowest elevation of Johannesburg is 378 m  . Johannesburg is at an elevation of 605 ft . The city province is Liaoning . 3,372,090 is the population of the urban region of Johannesburg . The density of  people in  the urban region of Johannesburg is 4,800/km 2  (12,000/sq mi) . The Johannesburg city highest elevation is 424 m (1,391 ft) . The population of the metro region is 8,653,521 , 8,917,749 (Extended UA) . 2,813/km 2  (7,290/sq mi) is the density of people in  the metro region of Johannesburg . The city land area is 225.73 sq km  (87.15 sq mi) . The coordinates of the city are 16°51′N 96°11′E﻿ / ﻿16.850°N 96.183°E . On 1871-11-04 the city was incorporated . Johannesburg is the government of Ministry of Culture . The demonym of the city Johannesburg is Indorian . Johannesburg is located in Sanma Province, Vanuatu . Takele Uma Benti is the mayor of Johannesburg . Area: 418 km2 (161 sq mi) is the area of the city namedJohannesburg .  The city area code is 9 . This city is named after Miami-Illinois:  shikaakwa  ,  (wild onion or wild garlic) . The postal code of the city is 21500
There are 630 residents per km 2 in Johannesburg