According to the United States Census Bureau, the CDP has a total area of 3.2 square miles (8.3 km²), all of it land.
As of the census of 2000, there were 96 people, 42 households, and 27 families residing in the CDP. The population density was 29.9 people per square mile (11.5/km²). There were 51 housing units at an average density of 15.9/sq mi (6.1/km²). The racial makeup of the CDP was 84.38% White, 12.50% Native American, and 3.12% from two or more races. Hispanic or Latino of any race were 2.08% of the population.
There were 42 households out of which 35.7% had children under the age of 18 living with them, 50.0% were married couples living together, 7.1% had a female householder with no husband present, and 35.7% were non-families. 31.0% of all households were made up of individuals and 14.3% had someone living alone who was 65 years of age or older. The average household size was 2.29 and the average family size was 2.81.
In the CDP the population was spread out with 29.2% under the age of 18, 3.1% from 18 to 24, 21.9% from 25 to 44, 34.4% from 45 to 64, and 11.5% who were 65 years of age or older. The median age was 44 years. For every 100 females there were 108.7 males. For every 100 females age 18 and over, there were 119.4 males.
The median income for a household in the CDP was $26,250, and the median income for a family was $26,750. Males had a median income of $30,000 versus $0 for females. The per capita income for the CDP was $9,211. There were 29.6% of families and 33.3% of the population living below the poverty line, including 47.2% of under eighteens and none of those over 64.
The provided census information is completely inaccurate. I worked for the census as a supervisor. I counted households in that area, private homes and Native American lands. I was a resident of Montgomery Creek for 12 years. At that time the local school district had a student body of 96. The percentage of Native American Residents is much higher. The sign entering town says 610 people.
In the state legislature Montgomery Creek is located in the 4th Senate District, represented by Republican Sam Aanestad, and in the 2nd Assembly District, represented by Republican Doug LaMalfa. Federally, Montgomery Creek is located in California's 2nd congressional district, which has a Cook PVI of R +13 and is represented by Republican Wally Herger.
Actor Craig T. Nelson lived in Montgomery Creek while working as a janitor at Cedar Creek Elementary School.