United States

78666 post code

Post code details

1 place

Code

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

Places under this code

Place	Region	County	Coordinates
San Marcos	Texas	Hays	29.8754, -97.9404

Nearby codes

All →

78646 78648 78650 78651 78652 78653 78654 78655 78656 78657 78658 78659

Same code in other countries

This 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.

The data is unofficial and has known truncation; verify with the recipient and carrier for critical shipments. See data source & license → · Updated 2026-11-09. Attribution in