78666 postal code
United StatesUpdated 2026-11-09San Marcos, TexasHays5 digits
Postal code details
1 placeCode
78666
Place
San Marcos
Region
Texas
County
Hays
Coordinates
29.8754, -97.9404
Accuracy
4 / 6
Country
United States
Location
OpenStreetMap ↗
29.8754, -97.9404© OpenStreetMap
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Places under this code
1| Place | Region | County | Coordinates |
|---|---|---|---|
| San Marcos | Texas | Hays | 29.8754, -97.9404 |
Same code in other countries
0This code only appears in this country.
FAQ
Which city is 78666 in?
San Marcos, Texas, United States.
What are the coordinates of 78666?
29.8754, -97.9404
Is 78666 used in other countries?
No.
Updated 2026-11-09. Attribution in Data & license.