San Marcos, TX Post Offices

San Marcos, Texas has a population of 66,350. According to the 2021 census, the city's 2 post offices serve 22,775 households with a median income of 22,775. The city is located in Caldwell County / Guadalupe County / Hays County and has a land area of 93,920,028 and a water area of 331,611.

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