San Marcos Texas ZIP Codes
San Marcos holds 2 ZIP codes, all inside one county and one postal prefix.
Every ZIP code in San Marcos
| ZIP code | County |
|---|---|
| 78666 | Hays County |
| 78667 | Hays County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the San Marcos codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for San Marcos. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every San Marcos ZIP code begins 786. Those first three digits identify the sectional center facility that processes mail for this part of Texas. Statewide that range covers 75 ZIP codes, so San Marcos accounts for 3% of it.
Every Texas ZIP prefix and the region it covers →
Area codes covering San Marcos
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground San Marcos occupies.
San Marcos Texas area codes in full →
Where San Marcos's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near San Marcos
| City | Distance | ZIP codes |
|---|---|---|
| Martindale Texas ZIP codes | 6.2 mi | 1 ZIP code |
| Kyle Texas ZIP codes | 8.9 mi | 1 ZIP code |
| Staples Texas ZIP codes | 10 mi | 1 ZIP code |
| Wimberley Texas ZIP codes | 12 mi | 1 ZIP code |
| Buda Texas ZIP codes | 15 mi | 1 ZIP code |
| Lockhart Texas ZIP codes | 15 mi | 1 ZIP code |
| New Braunfels Texas ZIP codes | 16 mi | 4 ZIP codes |
| Kingsbury Texas ZIP codes | 17 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.