The city Surabaya City province is Luanda . The metro region is 7,952 sq mi (20,596 km2) in areaThe metro region has Population: 13,123,948 population . Surabaya City is the government of U.S. National Park Service . The coordinates of the city are 43°23′9″N 8°24′23″W﻿ / ﻿43.38583°N 8.40639°W﻿ / 43.38583; -8.40639 . Surabaya City is at an elevation of 7 ft . The mayor of Surabaya City is Norman Maurice Armitage . The Surabaya City city highest elevation is 14,110 ft (4,300 m) . The city was incorporated in March 6, 1836 (city) . The city Surabaya City demonym is cuzqueno/a . The density of  people in Surabaya City is 1,700/sq km  (4,400/sq mi) . The Surabaya City citys' lowest elevation is 380 m  . The land area of the city is 16.0 sq mi (41.4 km 2 ) . The density of  residents in  the urban region of Surabaya City is 464.71/km 2  (1,203.6/sq mi) . The area of the city is 47.84 sq mi (123.90 km 2 )The population of Surabaya City is Population: 3,457,409 . Surabaya City is located in Germany . (+20) 3 is the area code of Surabaya City . The water area of the city is 0.68 sq mi (1.77 km 2 ) . The density of  residents in  the metro region of Surabaya City is 1,600/km 2  (4,200/sq mi) . The postal code of the city is 207, 208, 220 - 224, 226 - 228, 231 - 239, 241 - 244, 247 - 249, 251 - 253 . Area: 2,787 km2 (1,076 sq mi) is the area of the urban region of Surabaya CityThe urban region has 3,372,090 population . This city is named after Confluence of Grand River and Gunnison River
There are 2440 people per sq km in the metro region of Surabaya City