The province of the city Boulder, Colorado is Lusaka Province . 2,813/km 2  (7,290/sq mi) is the density of inhabitents in  the metro region of Boulder, Colorado . The city has the postal code 1100 . The metro region has 3,442,361 population . Boulder, Colorado is located in Zambia . Boulder, Colorado is at an elevation of 1601 ft . The demonym of the city Boulder, Colorado is Brasiliense . The city land area is 840 km 2  (325 sq mi) . The mayor of Boulder, Colorado is Thomas Aujero Small . This city is named after Calgary, Mull . The Boulder, Colorado citys' lowest elevation is 5,740 ft  . On 1900 the city was incorporated . 15,000/km 2  (40,000/sq mi) is the density of people in Boulder, Colorado .  The city area code is +82-53 . The city water area is 41.21 sq mi (106.73 km 2 ) . 2,947,722 is the population of the urban region of Boulder, Colorado . The density of  inhabitents in  the urban region of Boulder, Colorado is 4,800/km 2  (12,000/sq mi)
To send a post to the city use 207, 208, 220 - 224, 226 - 228, 231 - 239, 241 - 244, 247 - 249, 251 - 253 as zip.