Boulder is located in west Montana. Boulder is part of Jefferson County. Boulder has 1.13 square miles of land area and has no water area. As of 2010-2014, the total Boulder population is 1,281, which has shrunk 1.46% since 2000. The population growth rate is much lower than the state average rate of 11.55% and is much lower than the national average rate of 11.61%. Boulder median household income is $37,375 in 2010-2014 and has grown by 27.66% since 2000. The income growth rate is much lower than the state average rate of 41.61% and is about the same as the national average rate of 27.36%. Boulder median house value is $128,700 in 2010-2014 and has grown by 78.25% since 2000. The house value growth rate is lower than the state average rate of 88.54% and is much higher than the national average rate of 46.91%. As a reference, the national Consumer Price Index (CPI) inflation rate for the same period is 26.63%. On average, the public school district that covers Boulder is worse than the state average in quality. The Boulder area code is 406.