The Derby city highest elevation is 91 m (299 ft) . The postal code of the city is 9XXXXXX . The density of  residents in Derby is 850/km 2  (2,200/sq mi) . The urban region is 335.4 sq mi (539.7 km 2 ) in area . Derby is located in Magelang, Central Java . The density of  people in  the urban region of Derby is 7,500/km 2  (19,000/sq mi) . The Derby citys' lowest elevation is 620 ft . +82-53 is the area code of Derby . 68.17 sq mi (176.56 sq km) is the area of the city namedDerby . The water area of the city is 0.37 sq mi (0.95 km 2 ) . 8°3′S 34°54′W﻿ / ﻿8.050°S 34.900°W are the coordinates of the city. . The city Derby demonym is Santiaguinos  (- as ) . 2,200/km 2  (5,700/sq mi) is the density of residents in  the metro region of Derby . The city land area is 225.73 sq km  (87.15 sq mi) . On 1799 (Guyandotte) the city was incorporated . Derby is named for Rao Jodha . The mayor of Derby is Kakha Kaladze . Derby is at an elevation of 20 ft . The city province is Sichuan
The peak of Derby is at 2,715 m (8,907 ft)