Happys Inn, MT has a population of 86 and is the 27,274th largest city in the United States. The population density is 9 per sq mi which is 28% higher than the Montana average and 90% lower than the national average. The median age in Happys Inn is 70 which is approximately 76% higher than the Montana average of 40. In Happys Inn, 87% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 72% of Happys Inn residents were born in Montana, 28% were born out of state, 0% were born outside of the United States and 0% were foreign born.