Where is zip code 78231
Welcome to SAN ANTONIO, TX 78231. 78231 is a urban zip code in San Antonio, Texas. The population is primarily white, older, and mostly married couples. At $208,300 the average home value here is a bit higher than average for the San Antonio metro area, so this probably isn't the place to look for housing bargains.n the 78231 zip code, the registered sex offenders can be found at https://records.txdps.state.tx.us/DPS_WEB/SorNew/index.aspx. Please be sure to read all the disclaimers provided by the state.