According to the United States Census Bureau, the Willow Valley CDP has a total area of 5.0 square miles (13 km2), of which 0.04 square miles (0.10 km2), or 0.76%, are water.[1]
At the 2000 census there were 585 people, 274 households, and 192 families living in the CDP. The population density was 601.9 inhabitants per square mile (232.4/km2). There were 464 housing units at an average density of 477.4 per square mile (184.3/km2). The racial makeup of the CDP was 93.16% White, 0.17% Black or African American, 1.71% Native American, 0.34% Asian, 1.88% from other races, and 2.74% from two or more races. 6.67% of the population were Hispanic or Latino of any race.[5]
Of the 274 households 14.6% had children under the age of 18 living with them, 58.4% were married couples living together, 7.3% had a female householder with no husband present, and 29.6% were non-families. 24.1% of households were one person and 13.1% were one person aged 65 or older. The average household size was 2.14 and the average family size was 2.48.
The age distribution was 13.7% under the age of 18, 2.4% from 18 to 24, 21.5% from 25 to 44, 29.4% from 45 to 64, and 33.0% 65 or older. The median age was 56 years. For every 100 females, there were 101.0 males. For every 100 females age 18 and over, there were 98.0 males.
The median household income was $39,250 and the median family income was $41,406. Males had a median income of $25,147 versus $24,219 for females. The per capita income for the CDP was $16,956. None of the population or families were below the poverty line.