The city is 68.17 sq mi (176.56 sq km) in area . Derby is at an elevation of 6 m . 2,200/km 2  (5,700/sq mi) is the density of residents in  the metro region of Derby . The mayor of Derby is Kakha Kaladze . The density of  residents in Derby is 850/km 2  (2,200/sq mi) . The highest elevation of Derby is 91 m (299 ft) . The density of  people in  the urban region of Derby is 7,500/km 2  (19,000/sq mi) . The city Derby demonym is Santiaguinos  (- as ) . The city water area is 0.37 sq mi (0.95 km 2 ) . On 1799 (Guyandotte) the city was incorporated . The coordinates of the city are 8°3′S 34°54′W﻿ / ﻿8.050°S 34.900°W . The postal code of the city is 9XXXXXX . The area of the urban region is 335.4 sq mi (539.7 km 2 ) . This city is named after Rao Jodha . The lowest elevation of Derby is 620 ft . Derby is located in Magelang, Central Java . The city land area is 225.73 sq km  (87.15 sq mi) . +82-53 is the area code of Derby . The city province is Sichuan
The urban region of Derby is 1049 sq mi