227.70 km 2  (87.92 sq mi) is the area of the urban region of Boulder, Colorado . Boulder, Colorado is at an elevation of 277 m . The city water area is 1.63 sq mi (4.23 km 2 ) 1.1% . 4,800/km 2  (12,000/sq mi) is the density of residents in  the urban region of Boulder, Colorado . 3,200/km 2  (8,200/sq mi) is the density of residents in Boulder, Colorado . The land area of the city is 8.921 sq mi (23.106 km 2 ) . Boulder, Colorado is located in Czech Republic . The area of the metro region is 474.649 sq mi (1,229.34 km2) .  The city area code is 216  (Asian side) . The city Boulder, Colorado province is Algiers Province . 210.9/km 2  (546.2/sq mi) is the density of people in  the metro region of Boulder, Colorado . The postal code of the city is 16000 . The city was incorporated in 1799 (Guyandotte) . Tang Liangzhi is the mayor of Boulder, Colorado . The highest elevation of Boulder, Colorado is 14,110 ft (4,300 m) . The city Boulder, Colorado demonym is Barranquillero/a . The coordinates of the city are 0°57′50″N 74°47′47″W﻿ / ﻿10.96389°N 74.79639°W . The Boulder, Colorado citys' lowest elevation is 378 m  . The population of Boulder, Colorado is Population: 971,592 (2016) . Boulder, Colorado is the government of U.S. National Park Service
Official address of residents of the city Boulder, Colorado has zip code 16000