San Marcos, TX ZIP Codes, Coordinates & Counties
San Marcos, Texas has 1 ZIP code in Hays county. The approximate center of San Marcos is 29.88, -97.966. San Marcos has about 325,205 known street addresses.
ZIP codes in San Marcos, TX
| ZIP Code | County | Latitude | Longitude |
|---|---|---|---|
| 78666 | Hays | 29.88 | -97.966 |
Counties San Marcos spans
Hays
Most common streets in San Marcos
Aquarena Springs, River, Hunter, Post, Interstate 35, Thorpe, Redwood, Lbj, Sadler, Oak
Frequently asked questions
What ZIP codes are in San Marcos, TX?
San Marcos, Texas has 1 ZIP code, ranging from 78666 to 78666. The full list, with each ZIP's county and coordinates, is in the table on this page.
What county is San Marcos, TX in?
San Marcos is in Hays county.
What are the latitude and longitude of San Marcos, TX?
The approximate center of San Marcos, Texas is latitude 29.88, longitude -97.966. Coordinates for each ZIP code are listed in the table above.
How many ZIP codes does San Marcos, TX have?
San Marcos has 1 ZIP code.
How many addresses are in San Marcos, TX?
San Marcos, Texas has about 325,205 known street addresses in the sthan.io US address database.
What are the most common streets in San Marcos, TX?
Some of the most common street names in San Marcos are Aquarena Springs, River, Hunter, Post, Interstate 35, Thorpe.
What cities are near San Marcos, TX?
Cities near San Marcos include Martindale (9 mi), Maxwell (10 mi), Kyle (11 mi), Staples (12 mi), New Braunfels (14 mi).
Cities near San Marcos
Martindale, TX (9 mi) Maxwell, TX (10 mi) Kyle, TX (11 mi) Staples, TX (12 mi) New Braunfels, TX (14 mi) Fentress, TX (14 mi) Wimberley, TX (15 mi) Buda, TX (16 mi)
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View the API →Last updated: June 2026 · Data: sthan.io US address database