The postal code of the city is 090101 to 090158 . The city was incorporated in 1900 .  The city area code is (+213) 021 . The urban region is 9,014.3 sq mi (3,843.8 sq km) in area . The coordinates of the city are 35°52′N 128°36′E﻿ / ﻿35.867°N 128.600°E . Zhang Guoqing is the mayor of UNESCO World Heritage Site . 1,500/km 2  (3,900/sq mi) is the density of people in  the metro region of UNESCO World Heritage Site . UNESCO World Heritage Site is located in People's Republic of China . The lowest elevation of UNESCO World Heritage Site is 865 m  . The population of UNESCO World Heritage Site is Population: 2,698,077  . The city water area is 4.12 sq mi (10.67 km 2 ) . 3,423/km 2  (8,870/sq mi) is the density of inhabitents in  the urban region of UNESCO World Heritage Site . The highest elevation of UNESCO World Heritage Site is 424 m (1,391 ft) . The city land area is 225.73 sq km  (87.15 sq mi) . The city UNESCO World Heritage Site province is Razavi Khorasan . UNESCO World Heritage Site is at an elevation of 1250 ft
1,879 m (6,165 ft) is the highest peak in the UNESCO World Heritage Site city.