ZIP code 78663
Where is ZIP code 78663?
Round Mountain, Texas
Blanco County · Standard ZIP code
ZIP code 78663 belongs to Round Mountain, Texas in Blanco County. 78663 is a standard ZIP code, so it covers street addresses as well as PO Boxes. It is in the Central Time zone and uses area codes 325, 512, 737 and 830. About 503 people live in the 78663 area, where the median household income is $168,125. The closest ZIP codes are 78657 (Horseshoe Bay, 7.9 mi northeast), 78636 (Johnson City, 11 mi south) and 78654 (Marble Falls, 13.4 mi northeast).
| ZIP code | 78663 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Round Mountain |
| Also accepted | Cypress Mill, Round Mtn |
| State | Texas (TX) |
| County | Blanco County |
| Time zone | Central Time · now |
| Area codes | 325, 512, 737, 830 |
| Coordinates | 30.4429, -98.4365 map |
| 3-digit prefix | 786 |
Population and income in 78663
| Population | 503 · lower than 83% of Texas ZIP codes |
|---|---|
| People per square mile | 5 · lower than 88% of Texas ZIP codes |
| Median age | 65.4 years · higher than 98% of Texas ZIP codes |
| Men / women | 60% / 40% |
| Median household income | $168,125 · higher than 98% of Texas ZIP codes |
| Income per person | $100,059 |
| Below the poverty line | 3.6% |
| Bachelor’s degree or higher | 43% of adults 25+ |
| Median home value | $356,800 · higher than 83% of Texas ZIP codes |
| Median rent | $1,688 a month |
| Housing units | 288 |
| Households | 276 (1.82 people on average) |
| Owners / renters | 83% / 17% |
| Land area | 108.48 sq mi (plus 0.64 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 78663. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 78663
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 78657 | Horseshoe Bay, TX | 7.9 mi NE | Standard |
| 78636 | Johnson City, TX | 11 mi S | Standard |
| 78654 | Marble Falls, TX | 13.4 mi NE | Standard |
| 78675 | Willow City, TX | 13.6 mi W | Standard |
| 78639 | Kingsland, TX | 15.4 mi N | Standard |
| 78635 | Hye, TX | 16.1 mi S | Standard |
| 78671 | Stonewall, TX | 19.3 mi SW | Standard |
| 78643 | Llano, TX | 21.5 mi NW | Standard |
| 78609 | Buchanan Dam, TX | 21.5 mi N | Standard |
| 78669 | Spicewood, TX | 23.1 mi E | Standard |
| 78606 | Blanco, TX | 24.6 mi S | Standard |
| 78620 | Dripping Springs, TX | 24.9 mi SE | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 78663 or measure the distance to another ZIP code.
How to address mail to 78663
123 MAIN ST
ROUND MOUNTAIN TX 78663
Put the city, the two-letter state code and the ZIP code on the last line. USPS also accepts CYPRESS MILL and ROUND MTN as the city name for 78663. Adding the 4-digit ZIP+4 code (78663-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 78663?
- 78663 is a Round Mountain, Texas ZIP code. Cypress Mill and Round Mtn are also accepted as the city name.
- What county is 78663 in?
- ZIP code 78663 is in Blanco County, Texas.
- What time zone is ZIP code 78663 in?
- 78663 is in the Central Time zone (America/Chicago).
- What area code is 78663?
- Phone numbers in ZIP code 78663 use area codes 325, 512, 737 and 830.
- What is the population of ZIP code 78663?
- About 503 people live in ZIP code 78663, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 78663?
- The median household income in 78663 is $168,125 a year, higher than 98% of Texas ZIP codes.
- What ZIP codes are near 78663?
- The nearest ZIP codes to 78663 are 78657 (Horseshoe Bay, 7.9 miles), 78636 (Johnson City, 11 miles), 78654 (Marble Falls, 13.4 miles) and 78675 (Willow City, 13.6 miles).