This city is named after Calgary, Mull . The area of the urban region is Area : 993.5 km2 (383.6 sq mi) .  The city area code is 0211 . Johannesburg is at an elevation of 6 m . The water area of the city is 4.12 sq mi (10.67 km 2 ) . The Johannesburg city highest elevation is 424 m (1,391 ft) . 210.9/km 2  (546.2/sq mi) is the density of inhabitents in  the metro region of Johannesburg . The land area of the city is 1.275 sq mi (3.303 sq km ) . The city was incorporated in 1871 (Huntington) . The city Johannesburg demonym is Mashhadi, Mashadi, Mashdi (informal) . Johannesburg has 19.500.000 population . Population: 3,113,725  is the population of the metro region of Johannesburg . Johannesburg is the government of Swedish Ice Hockey Association . The coordinates of the city are 56°19′37″N 44°00′27″E﻿ / ﻿56.32694°N 44.00750°E  . The province of the city Johannesburg is Kadiogo . The lowest elevation of Johannesburg is 1,750 m . Armand Béouindé (since 2016) is the mayor of Johannesburg . The postal code of the city is 080020 . The density of  residents in  the urban region of Johannesburg is 2,305/km 2  (5,970/sq mi) . 7,400/km 2  (19,000/sq mi) is the density of residents in Johannesburg
Highest point is -1326 m above the lowest point of this city