Belfry is a census-designated place (CDP) in Carbon County, Montana, United States. It is part of the Billings, Montana Metropolitan Statistical Area. The population was 218 at the 2010 census. It is located approximately 11 miles (18 km) from the Wyoming border, roughly halfway between Billings, Montana and Cody, Wyoming.
Belfry is located in south-central Carbon County at 45°8′29″N 109°0′28″W / 45.14139°N 109.00778°W / 45.14139; -109.00778 (45.141506, -109.007779).
According to the United States Census Bureau, the CDP has a total area of 1.72 square miles (4.45 km), of which 1.66 square miles (4.31 km) is land and 0.054 square miles (0.14 km), or 3.10%, is water. The Clarks Fork of the Yellowstone River runs just east of the main part of the town.
As of the census of 2000, there were 219 people, 98 households, and 53 families residing in the CDP. The population density was 115.1 people per square mile (44.5/km²). There were 119 housing units at an average density of 62.5 per square mile (24.2/km²). The racial makeup of the CDP was 98.63% White, 0.91% Native American, and 0.46% from two or more races. Hispanic or Latino of any race were 1.83% of the population.
There were 98 households out of which 29.6% had children under the age of 18 living with them, 45.9% were married couples living together, 8.2% had a female householder with no husband present, and 44.9% were non-families. 41.8% of all households were made up of individuals and 16.3% had someone living alone who was 65 years of age or older. The average household size was 2.23 and the average family size was 3.17.
In the CDP, the population was spread out with 27.4% under the age of 18, 6.8% from 18 to 24, 21.5% from 25 to 44, 23.3% from 45 to 64, and 21.0% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 95.5 males. For every 100 females age 18 and over, there were 87.1 males.
The median income for a household in the CDP was $25,313, and the median income for a family was $43,750. Males had a median income of $16,667 versus $15,500 for females. The per capita income for the CDP was $13,186. About 16.3% of families and 20.3% of the population were below the poverty line, including 15.1% of those under the age of eighteen and 11.6% of those sixty five or over.