ZIP Code 78666

  • Zip Code: 78666
  • Type: Standard
  • Official USPS city name: San Marcos
  • Official USPS State Code: TX
  • Official State Name: Texas
  • ZCTA: TRUE
  • Population: 82923.0
  • Density: 181.3
  • Primary Official County Code: 48209
  • Primary Official County Name: Hays
  • Official County Name: Hays| Guadalupe| Caldwell| Comal
  • Official County Code: 48209| 48187| 48055| 48091
  • Imprecise: FALSE
  • Military: FALSE
  • Timezone: America/Chicago (13:27 PM Tuesday, July 08 2025-07-08 (GMT -0500))
  • Geo Point: 29.87958, -97.96642


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