Winchester is located at 33°42'28" North, 117°5'13" West (33.707871, -117.086861)1.
As of the census2 of 2000, there are 2,155 people, 741 households, and 532 families residing in the CDP. The population density is 117.4/km² (304.1/mi²). There are 819 housing units at an average density of 44.6/km² (115.6/mi²). The racial makeup of the CDP is 78.05% White, 1.95% African American, 1.53% Native American, 0.37% Asian, 0.28% Pacific Islander, 14.34% from other races, and 3.48% from two or more races. 31.42% of the population are Hispanic or Latino of any race.
There are 741 households out of which 32.5% have children under the age of 18 living with them, 54.9% are married couples living together, 10.5% have a female householder with no husband present, and 28.2% are non-families. 22.0% of all households are made up of individuals and 9.4% have someone living alone who is 65 years of age or older. The average household size is 2.91 and the average family size is 3.36.
In the CDP the population is spread out with 28.2% under the age of 18, 8.4% from 18 to 24, 26.1% from 25 to 44, 22.5% from 45 to 64, and 14.8% who are 65 years of age or older. The median age is 37 years. For every 100 females there are 99.9 males. For every 100 females age 18 and over, there are 98.0 males.
The median income for a household in the CDP is $33,472, and the median income for a family is $39,167. Males have a median income of $26,354 versus $28,021 for females. The per capita income for the CDP is $15,028. 13.8% of the population and 9.7% of families are below the poverty line. Out of the total population, 9.8% of those under the age of 18 and 11.6% of those 65 and older are living below the poverty line.