The population of the metro region is 3,442,361 . The city land area is 840 km 2  (325 sq mi) . Thomas Aujero Small is the mayor of Boulder, Colorado . The demonym of the city Boulder, Colorado is Brasiliense . 15,000/km 2  (40,000/sq mi) is the density of people in Boulder, Colorado . The density of  inhabitents in  the metro region of Boulder, Colorado is 2,813/km 2  (7,290/sq mi) . On 1900 the city was incorporated . The density of  inhabitents in  the urban region of Boulder, Colorado is 4,800/km 2  (12,000/sq mi) . This city is named after Calgary, Mull . Boulder, Colorado is at an elevation of 488 m . Boulder, Colorado is located in Zambia . The city province is Lusaka Province .  The city area code is +82-53 . The postal code of the city is 1100 . The city water area is 41.21 sq mi (106.73 km 2 ) . The urban region has 2,947,722 population . The lowest elevation of Boulder, Colorado is 5,740 ft 
Land covers 1359 km 2 area of the city