ZIP Code 78666
San Marcos · Hays, Texas
78666 is the ZIP code of San Marcos in Hays, Texas, United States.
- ZIP Code
- 78666
- County
- Hays
- State
- Texas
- Country
- United States
Place with ZIP code 78666
| Place | County | Location |
|---|---|---|
| San Marcos | Hays | 29.875, -97.940 |
Near Austin
The nearest major city is Austin, about 48 km away.
Nearby ZIP codes
Frequently asked questions
Which places use ZIP code 78666?
San Marcos.
Which county and state is 78666 in?
Hays, Texas, United States.
What is the nearest major city to 78666?
Austin, about 48 km away.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.