Postal entity record
US 78666 Postal Code Data Source-backed
78666 postal code facts for San Marcos, US: region, coordinates, source, and nearby postal codes.
CountryUS
PlaceSan Marcos
RegionTX
Nearby rows12
Key metadata
| Place | San Marcos |
|---|---|
| Admin area | Texas / TX |
| Local area | Hays |
| Coordinates | 29.8754, -97.9404 |
| GeoNames accuracy | 4 |
| Source | GeoNames postal code data |
| License | GeoNames postal data; provided as-is with attribution required. |
| Snapshot date | 2026-06-02 |
What this record means
This row links US 78666 to San Marcos, the available admin area, centroid coordinates, source accuracy, and source snapshot metadata.
Use it as a reference-data join for cleaning CRM rows, grouping operational reports, preparing territory QA, or checking whether an imported postal value has a source-backed match.
What the centroid can support
The latitude and longitude represent a postal centroid from the source snapshot. They are useful for approximate map previews, nearby-record review, deduplication checks, and distance-based QA.
They should not be treated as an official delivery boundary, address-level geocode, tax boundary, or service-area guarantee.
Sample CSV enrichment output
| Input field | Added output | Example value |
|---|---|---|
| postal_code | matched_place | San Marcos |
| postal_code | admin_area | Texas |
| postal_code | centroid | 29.8754, -97.9404 |
Nearby postal codes
| Code | Place | Region | Distance |
|---|---|---|---|
| 78655 | Martindale | Texas | 5.9 mi |
| 78656 | Maxwell | Texas | 7.7 mi |
| 78670 | Staples | Texas | 10.3 mi |
| 78640 | Kyle | Texas | 10.5 mi |
| 78622 | Fentress | Texas | 12.8 mi |
| 78667 | San Marcos | Texas | 12.9 mi |
| 78130 | New Braunfels | Texas | 13.2 mi |
| 78676 | Wimberley | Texas | 14.7 mi |
| 78638 | Kingsbury | Texas | 15.5 mi |
| 78661 | Prairie Lea | Texas | 15.7 mi |
| 78610 | Buda | Texas | 15.8 mi |
| 78644 | Lockhart | Texas | 15.8 mi |