The city Boulder, Colorado demonym is Brasiliense . The city Boulder, Colorado province is Lusaka Province . The metro region has 3,442,361 population . Boulder, Colorado is at an elevation of 1601 ft . The lowest elevation of Boulder, Colorado is 5,740 ft  . On 1900 the city was incorporated . The urban region has 2,947,722 population . The mayor of Boulder, Colorado is Thomas Aujero Small . Boulder, Colorado is named for Calgary, Mull . The postal code of the city is 1100 . The water area of the city is 41.21 sq mi (106.73 km 2 ) . Boulder, Colorado is located in Zambia . 4,800/km 2  (12,000/sq mi) is the density of inhabitents in  the urban region of Boulder, Colorado . The city land area is 840 km 2  (325 sq mi) . The density of  people in Boulder, Colorado is 15,000/km 2  (40,000/sq mi) . The density of  inhabitents in  the metro region of Boulder, Colorado is 2,813/km 2  (7,290/sq mi) .  The city area code is +82-53
People of the city Boulder, Colorado are called by Cartagenero(s) (in Spanish)