Westley is located at GR1.(37.548255, -121.201264)
As of the censusGR2 of 2000, there were 747 people, 139 households, and 128 families residing in the CDP. The population density was 171.7/km² (445.4/mi²). There were 151 housing units at an average density of 34.7/km² (90.0/mi²). The racial makeup of the CDP was 39.36% White, 1.07% African American, 2.41% Native American, 0.54% Asian, 0.27% Pacific Islander, 53.82% from other races, and 2.54% from two or more races. Hispanic or Latino of any race were 83.94% of the population.
There were 139 households out of which 67.6% had children under the age of 18 living with them, 76.3% were married couples living together, 11.5% had a female householder with no husband present, and 7.2% were non-families. 7.2% of all households were made up of individuals and 3.6% had someone living alone who was 65 years of age or older. The average household size was 4.38 and the average family size was 4.54.
In the CDP the population was spread out with 36.8% under the age of 18, 12.4% from 18 to 24, 30.1% from 25 to 44, 17.1% from 45 to 64, and 3.5% who were 65 years of age or older. The median age was 26 years. For every 100 females there were 126.4 males. For every 100 females age 18 and over, there were 137.2 males.
The median income for a household in the CDP was $20,417, and the median income for a family was $21,458. Males had a median income of $16,691 versus $23,750 for females. The per capita income for the CDP was $6,137. About 42.6% of families and 64.9% of the population were below the poverty line, including 68.3% of those under age 18 and 27.8% of those age 65 or over.