Frazer is a census-designated place (CDP) in Valley County, Montana, United States, located within the Fort Peck Indian Reservation, about 80 miles from the Canadian border. The population was 362 at the 2010 census.
Frazer is located at 48°02′56″N 106°02′55″W / 48.048907°N 106.048572°W / 48.048907; -106.048572 (48.048907, -106.048572).
According to the United States Census Bureau, the CDP has a total area of 1.7 square miles (4.4 km), of which 1.7 square miles (4.4 km) of it is land and 0.04 square miles (0.10 km) (1.75%) is water.
At the 2000 census there were 452 people, 115 households and 96 families residing in the CDP. The population density was 269.3 per square mile (103.9/km²). There were 122 housing units at an average density of 72.7 per square mile (28.0/km²). The racial makeup of the CDP was 7.08% White, 92.48% Native American, 0.22% from other races, and 0.22% from two or more races. Hispanic or Latino of any race were 0.44% of the population.
There were 115 households of which 49.6% had children under the age of 18 living with them, 38.3% were married couples living together, 33.9% had a female householder with no husband present and 16.5% were non-families. 14.8% of all households were made up of individuals and 2.6% had someone living alone who was 65 years of age or older. The average household size was 3.93 and the average family size was 4.21.
41.6% of the population were under the age of 18, 10.0% from 18 to 24, 31.0% from 25 to 44, 12.4% from 45 to 64, and 5.1% who were 65 years of age or older. The median age was 24 years. For every 100 females, there were 110.2 males. For every 100 females age 18 and over, there were 91.3 males.
The median household income was $19,500 and the median family income was $16,458. Males had a median income of $24,500 females $18,438. The per capita income for the CDP was $6,435. About 47.3% of families and 47.1% of the population were below the poverty line, including 44.7% of those under age 18 and 50.0% of those age 65 or over.