The city land area is 840 km 2  (325 sq mi) . 2,813/km 2  (7,290/sq mi) is the density of inhabitents in  the metro region of Boulder, Colorado . The city water area is 41.21 sq mi (106.73 km 2 ) . Boulder, Colorado is named for Calgary, Mull . Boulder, Colorado is located in Zambia . The city has the postal code 1100 . Thomas Aujero Small is the mayor of Boulder, Colorado . The city was incorporated in 1900 . The lowest elevation of Boulder, Colorado is 5,740 ft  . 4,800/km 2  (12,000/sq mi) is the density of inhabitents in  the urban region of Boulder, Colorado . The city Boulder, Colorado demonym is Brasiliense . The density of  people in Boulder, Colorado is 15,000/km 2  (40,000/sq mi) . The province of the city Boulder, Colorado is Lusaka Province . The metro region has 3,442,361 population .  The city area code is +82-53 . Boulder, Colorado is at an elevation of 1601 ft . The urban region has 2,947,722 population
On December 23, 1814 (village) the city was awarded the legal declaration of a municipal charter.