Loma is a census-designated place in Chouteau County, Montana, United States. The population was 85 at the 2010 census.Loma is located in central Chouteau County at the confluence of the Marias River and Missouri River. U.S. Route 87 passes through the community, leading southwest 10 miles to Fort Benton, the Chouteau County seat, and northeast 60 miles to Havre.According to the United States Census Bureau, the CDP has a total area of 3.42 square miles, all of it land.Loma is the location of the most extreme recorded temperature change in a 24-hour period in the United States. On January 15, 1972, the temperature rose from −54 °F to 49 °F; a dramatic example of the regional Chinook wind in action.As of the census of 2000, there were 92 people, 40 households, and 25 families residing in the CDP. The population density was 26.6 people per square mile. There were 47 housing units at an average density of 13.6 per square mile. The racial makeup of the CDP was 97.83% White and 2.