Amsterdam, MT has a population of 170 and is the 25,151st largest city in the United States. The population density is 63 per sq mi which is 820% higher than the Montana average and 31% lower than the national average. The median age in Amsterdam is 34 which is approximately 14% lower than the Montana average of 40. In Amsterdam, 67% of the population over 15 years of age are married, 90% speak English and 5% speak Spanish. 56% of Amsterdam residents were born in Montana, 39% were born out of state, 0% were born outside of the United States and 4% were foreign born.