9,014.3 sq mi (3,843.8 sq km) is the area of the urban region of UNESCO World Heritage Site . On 1900 the city was incorporated . 3,423/km 2  (8,870/sq mi) is the density of inhabitents in  the urban region of UNESCO World Heritage Site . The UNESCO World Heritage Site citys' lowest elevation is 865 m  . UNESCO World Heritage Site is located in People's Republic of China . The postal code of the city is 090101 to 090158 . The highest elevation of UNESCO World Heritage Site is 424 m (1,391 ft) . (+213) 021 is the area code of UNESCO World Heritage Site . The province of the city UNESCO World Heritage Site is Razavi Khorasan . 35°52′N 128°36′E﻿ / ﻿35.867°N 128.600°E are the coordinates of the city. . The mayor of UNESCO World Heritage Site is Zhang Guoqing . The land area of the city is 225.73 sq km  (87.15 sq mi) . UNESCO World Heritage Site has Population: 2,698,077  population . 1,500/km 2  (3,900/sq mi) is the density of people in  the metro region of UNESCO World Heritage Site . The city water area is 4.12 sq mi (10.67 km 2 ) . UNESCO World Heritage Site is at an elevation of 1250 ft
(+20) 2 is a prefix required to call a number in UNESCO World Heritage Site