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Castle Hills is a city located in Bexar County, Texas, United States. As of the 2000 census, the city had a total population of 4,202. It is a suburb of San Antonio.
Castle Hills is located at 29°31'18" North, 98°30'60" West (29.521762, -98.516601).
According to the United States Census Bureau, the city has a total area of 2.5 square miles (6.4 km²), of which, 2.5 square miles (6.4 km²) of it is land and none of the area is covered with water.
Castle Hills is an independent city, completely surrounded by the city of San Antonio. It is bisected into a northern and southern half by interstate highway loop I-410. It is located at the southern end of Northwest Military Highway, the northern end being located at U.S. Army Camp Bullis.
As of the census of 2000, there are 4,202 people, 1,866 households, and 1,218 families residing in the city. The population density is 1,694.1 people per square mile (654.2/km²). There are 1,930 housing units at an average density of 778.1/sq mi (300.5/km²). The racial makeup of the city is 91.98% White, 0.64% African American, 0.19% Native American, 1.76% Asian, 0.02% Pacific Islander, 3.64% from other races, and 1.76% from two or more races. 28.70% of the population are Hispanic or Latino of any race.
There are 1,866 households out of which 21.0% have children under the age of 18 living with them, 54.3% are married couples living together, 8.7% have a female householder with no husband present, and 34.7% are non-families. 31.5% of all households are made up of individuals and 24.3% have someone living alone who is 65 years of age or older. The average household size is 2.25 and the average family size is 2.82.
In the city the population is spread out with 19.4% under the age of 18, 4.4% from 18 to 24, 18.0% from 25 to 44, 24.0% from 45 to 64, and 34.3% who are 65 years of age or older. The median age is 51 years. For every 100 females there are 82.9 males. For every 100 females age 18 and over, there are 80.2 males.
The median income for a household in the city is $53,688, and the median income for a family is $71,065. Males have a median income of $54,833 versus $31,593 for females. The per capita income for the city is $38,909. 5.8% of the population and 3.8% of families are below the poverty line. Out of the total population, 7.7% of those under the age of 18 and 3.2% of those 65 and older are living below the poverty line.
The City of Castle Hills is served by the North East Independent School District.