Northwest Side San Antonio TX is located between Interstate 10 and Highway 16 from Loop 410 to Scenic Loop Road. The Northwest Side San Antonio area includes Leon Valley, Helotes, Grey Forest, and Cross Mountain in Bexar County, Texas. Some of the zip codes in Northwest Side, San Antonio, TX are 78229, 78240, 78255, and 78256 along with sections of 78249, and 78023. Search homes for sale in Northwest Side, San Antonio, TX, a city located in Bexar County. For more info about any of these Northwest Side, San Antonio real estate listings, click the "Request More Information" button.