The city water area is 0.37 sq mi (0.95 km 2 ) . Derby is located in Magelang, Central Java . The area of the city is 68.17 sq mi (176.56 sq km) . The Derby city highest elevation is 91 m (299 ft) . The density of  residents in Derby is 850/km 2  (2,200/sq mi) . The postal code of the city is 9XXXXXX . The lowest elevation of Derby is 190 m  .  The city area code is +82-53 . Derby is at an elevation of 20 ft . The density of  residents in  the metro region of Derby is 2,200/km 2  (5,700/sq mi) . On 1799 (Guyandotte) the city was incorporated . The land area of the city is 225.73 sq km  (87.15 sq mi) . The city province is Sichuan . The demonym of the city Derby is Santiaguinos  (- as ) . This city is named after Rao Jodha . 335.4 sq mi (539.7 km 2 ) is the area of the urban region of Derby . 7,500/km 2  (19,000/sq mi) is the density of inhabitents in  the urban region of Derby . The coordinates of the city are 8°3′S 34°54′W﻿ / ﻿8.050°S 34.900°W . The mayor of Derby is Kakha Kaladze
There are less than 2386 residents per sq mi in Derby