Southside, San Antonio, TX is located between Highway 90 and Interstate 35 and covers the area inside Anderson Loop 1604 in Bexar County. Some of the zip codes in Southside, San Antonio, TX are 78226, 78225, 78211, 78236, 78242, 78236, 78252, 78224, 78221, 78210, and sections of 78223. Search homes for sale in Southside San Antonio, TX. View details on the community and list of real estate services provided to home buyers and sellers in Southside San Antonio, TX. For more info about any of these Southside San Antonio real estate listings, click the "Request More Information" button.