The postal code of the city is 207, 208, 220 - 224, 226 - 228, 231 - 239, 241 - 244, 247 - 249, 251 - 253 . The density of  residents in  the urban region of Surabaya City is 464.71/km 2  (1,203.6/sq mi) . The highest elevation of Surabaya City is 14,110 ft (4,300 m) .  The city area code is (+20) 3 . Surabaya City is the government of U.S. National Park Service . Surabaya City is located in Germany . Norman Maurice Armitage is the mayor of Surabaya City . Surabaya City is named for Confluence of Grand River and Gunnison River . The city province is Luanda . The city water area is 0.68 sq mi (1.77 km 2 ) . Surabaya City is at an elevation of 7 ft . The density of  residents in  the metro region of Surabaya City is 1,600/km 2  (4,200/sq mi) . The city land area is 16.0 sq mi (41.4 km 2 ) . The coordinates of the city are 43°23′9″N 8°24′23″W﻿ / ﻿43.38583°N 8.40639°W﻿ / 43.38583; -8.40639 . 47.84 sq mi (123.90 km 2 ) is the area of the city namedSurabaya CityThe population of Surabaya City is Population: 3,457,409 . On March 6, 1836 (city) the city was incorporated . 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 . The lowest elevation of Surabaya City is 1,250 ft . The city Surabaya City demonym is cuzqueno/a . 7,952 sq mi (20,596 km2) is the area of the metro region of Surabaya CityThe metro region has Population: 13,123,948 population . 1,700/sq km  (4,400/sq mi) is the density of inhabitents in Surabaya City
There are 2391 inhabitents per sq km in Surabaya City