San Antonio Heights is an unincorporated community in San Bernardino County nestled at the head of historic Euclid Avenue. The rich history of this area can be traced back to the community's distinctive design, carved out by its curved and circular streets, which officially took shape in 1887. These curves and circles, as well as San Antonio Heights' profoundly independent residents, typify a charming community on the hill. San Antonio Heights and San Antonio Canyon were a main stage for many innovations of irrigation, hydroelectric power, passenger railroad, and other conveniences that contributed to an improved quality of life for the entire nation.