Derby is located in Magelang, Central Java . The city land area is 225.73 sq km  (87.15 sq mi) . Derby is named for Rao Jodha . 2,200/km 2  (5,700/sq mi) is the density of residents in  the metro region of Derby . The lowest elevation of Derby is 190 m  . 850/km 2  (2,200/sq mi) is the density of inhabitents in Derby . Kakha Kaladze is the mayor of Derby . The postal code of the city is 9XXXXXX . The city Derby province is Sichuan . Derby is at an elevation of 6 m . The highest elevation of Derby is 91 m (299 ft) . The city water area is 0.37 sq mi (0.95 km 2 ) . 7,500/km 2  (19,000/sq mi) is the density of inhabitents in  the urban region of Derby . The area of the urban region is 335.4 sq mi (539.7 km 2 ) . 8°3′S 34°54′W﻿ / ﻿8.050°S 34.900°W are the coordinates of the city. . +82-53 is the area code of Derby . The city Derby demonym is Santiaguinos  (- as ) . The city is 68.17 sq mi (176.56 sq km) in area . On 1799 (Guyandotte) the city was incorporated
176.56 sq km is the area of Derby