Castle Hills is an enclave city located in northern Bexar County, Texas, United States.

Castle Hills is an independent municipality, completely surrounded by the city of San Antonio.

The climate in this area is characterized by hot, humid summers and generally mild to cool winters.

[5] As of the 2020 United States census, there were 3,978 people, 1,558 households, and 1,106 families residing in the city.

[11][12] Jackson Middle School in San Antonio serves a portion of Castle Hills,[13] while Nimitz Middle School in San Antonio serves a portion of Castle Hills,[14] LEE High School serves all of Castle Hills.

Castle Hills has its own 911 Dispatch as well as Police, Fire, and Public Works departments.

Acadian Ambulance Service is the EMS provider for City of Castle Hills.

[17] Also located within Castle Hills is the McGimsey Boy Scout Camp, a 140-acre (0.57 km2) park for BSA use.