The city was incorporated in 1799 (Guyandotte) . The demonym of the city Derby is Santiaguinos  (- as ) . The density of  residents in  the metro region of Derby is 2,200/km 2  (5,700/sq mi) . +82-53 is the area code of Derby . The city land area is 225.73 sq km  (87.15 sq mi) . The city water area is 0.37 sq mi (0.95 km 2 ) . 850/km 2  (2,200/sq mi) is the density of inhabitents in Derby . The highest elevation of Derby is 91 m (299 ft) . The city has the postal code 9XXXXXX . The province of the city Derby is Sichuan . The area of the city is 68.17 sq mi (176.56 sq km) . Derby is located in Magelang, Central Java . 7,500/km 2  (19,000/sq mi) is the density of inhabitents in  the urban region of Derby . 335.4 sq mi (539.7 km 2 ) is the area of the urban region of Derby . The coordinates of the city are 8°3′S 34°54′W﻿ / ﻿8.050°S 34.900°W . Derby is named for Rao Jodha . Kakha Kaladze is the mayor of Derby . Derby is at an elevation of 20 ft . The lowest elevation of Derby is 190 m 
Land covers 464 sq km area of the city