Colstrip, MT has a population of 2,288 and is the 10,285th largest city in the United States. The population density is 566 per sq mi which is 8180% higher than the Montana average and 524% higher than the national average. The median age in Colstrip is 41 which is approximately 4% higher than the Montana average of 40. In Colstrip, 73% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 65% of Colstrip residents were born in Montana, 32% were born out of state, 0% were born outside of the United States and 2% were foreign born.