Zip Code 78663 — Round Mountain, TX
78663 is a ZIP Code associated with Round Mountain, TX, located within Blanco. The postal region supports an estimated population of 503 residents across Data Pending housing units, with a population density of 1.8 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (30.415820, -98.311440)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 78663 |
| Primary City | Round Mountain |
| State / Province | TX |
| County | Blanco |
| Total Population | 503 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 1.8 people/sq mi |
| Timezone | America/Chicago |
How 78663 Compares
| Metric | ZIP 78663 | Blanco County | TX State Average |
|---|
| Population | 503 | 12,001 | 30,188,035 |
| Median Income | Data Pending | N/A | N/A |
| Population Density | 1.8 /sq mi | -- | -- |
Nearby ZIP Codes
| ZIP Code | City | Distance | Population | Median Income |
|---|
| Zip 78657 | Horseshoe Bay | 9.1 mi | 7,591 | N/A |
| Zip 78636 | Johnson City | 9.6 mi | 4,134 | N/A |
| Zip 78669 | Spicewood | 10.8 mi | 12,592 | N/A |
| Zip 78654 | Marble Falls | 12.3 mi | 20,650 | N/A |
| Zip 78620 | Dripping Springs | 17.0 mi | 22,860 | N/A |
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →