Iron Mountain Lake is a city in St. Francois County, Missouri, United States. The population was 737 at the 2010 census.GeographyIron Mountain Lake is located .According to the United States Census Bureau, the city has a total area of 2.08sqmi, of which, 1.96sqmi is land and 0.12sqmi is water.Demographics2010 censusAs of the census of 2010, there were 737 people, 295 households, and 200 families residing in the city. The population density was 376.0PD/sqmi. There were 367 housing units at an average density of 187.2/sqmi. The racial makeup of the city was 96.20% White, 2.17% Native American, 0.14% Asian, 0.14% from other races, and 1.36% from two or more races. Hispanic or Latino of any race were 1.90% of the population.There were 295 households of which 29.2% had children under the age of 18 living with them, 45.8% were married couples living together, 13.6% had a female householder with no husband present, 8.5% had a male householder with no wife present, and 32.2% were non-families. 25.8% of all households were made up of individuals and 11.2% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 2.95.
