The city water area is 3.73 sq mi (9.67 km 2 ) . +55 (41) is the area code of Johannesburg . 6,600/km 2  (17,000/sq mi) is the density of people in  the metro region of Johannesburg . The highest elevation of Johannesburg is 425 m (1,394 ft) . Johannesburg is at an elevation of 2382 ft . The area of the urban region is Area : 993.5 km2 (383.6 sq mi) . The city has the postal code 1100 . Johannesburg is located in Flathead County & Glacier County, Montana, United States . The city was incorporated in November 7, 1861, as Denver City, C.T. . The density of  people in Johannesburg is 700/km 2  (1,800/sq mi) . The metro region has 4,005,015 population . Pramila Pandey (BJP) is the mayor of Johannesburg . Johannesburg is named for James W. Denver . The coordinates of the city are 26°10′S 28°18′E﻿ / ﻿26.167°S 28.300°E . The city province is Cebu (geographically only) . The demonym of the city Johannesburg is Guayaquilean . The Johannesburg citys' lowest elevation is 1,250 ft . 3,423/km 2  (8,870/sq mi) is the density of inhabitents in  the urban region of Johannesburg . The area of the city is Area: 572 km2 (221 sq mi)
There are 4407 people per sq km in the urban region of Johannesburg