Geyser is a small census-designated place in Judith Basin County, Montana, United States, approximately 50 miles East of Great Falls along US-87. The town's name originated from the mud springs in the area the town was first founded. Geyser was moved to its present location with the construction of the Great Northern Rail line between Great Falls and Billings.As of the 2010 census, Geyser's population was 505 people making it 25% larger than the county seat of Stanford and accounting for one quarter of the population of Judith Basin County. The average household size is 2.8 people.The racial makeup of the town was 96.8% White, 0.2% Native American, and 2.3% from two or more races. Hispanic or Latino of any race were 0.7% of the population. [1]