What city is ZIP code 78663?

ZIP code 78663 is in Round Mountain, TX (Blanco County).

What county is ZIP code 78663 in?

ZIP code 78663 is mostly in Blanco County, Texas.

How many people live in ZIP code 78663?

About 503 people live in the 78663 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.

Checked Oct 26, 2026

ZIP Code 78663

Round Mountain, TX, Blanco County

Population

503

Land area

108.5sq mi

People per sq mi

City

Round Mountain

ZIP 78663 and nearby ZIP codes

Full map

ZIP 78663 at a glance

ZIP 78663 (Round Mountain) is 96% less dense than Texas as a whole.
The median household income is $168,125, about 2.1 times the Texas median of $78,476.
A typical owner-occupied home is valued at $356,800 (26% above Texas) and median rent is $1,688 a month.

Local data for ZIP 78663

Counts from official public data

Housing and community stats

ZIP 78663, American Community Survey 2020-2024

Full profile

Median household income

$168,125

Poverty rate

3.6%

Median home value

$356,800

Median rent

$1,688/mo

Homeownership

83.0%

Bachelor's or higher

42.7%

Median age

65.4

Average commute

50.5 min

Income, education and commute

Economy and federal money

Businesses, pandemic loans and political donations

Details

Business establishments

ZIP Business Patterns 2023

Employees

134

$12M annual payroll

PPP loans

$2.5M

37 loans

Campaign donations

$56K

4% D, 30% R, 2026 cycle

PPP loans in this ZIP

Environment and hazard risk

ZIP 78663, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Very Low

Top: drought

Storm events since 1996

329

Countywide, mostly drought

Flood insurance policies

1.4% of homes, county

July high / Jan low

96° / 35°F

33.0 inches of rain a year

Hazards, floods and storm history Check a flood zone

Health statistics

Share of adults in ZIP 78663, CDC PLACES estimates

All 40 measures

Obesity

33.8%

U.S. 33.3% +0.5 pts

Diabetes

13.7%

U.S. 12.1% +1.6 pts

Smoking

10.5%

U.S. 12.8% -2.3 pts

Uninsured (18-64)

9.2%

U.S. 11.1% -1.9 pts

Frequently asked questions

What city is ZIP code 78663?: ZIP code 78663 is in Round Mountain, TX (Blanco County).
What county is ZIP code 78663 in?: ZIP code 78663 is mostly in Blanco County, Texas.
How many people live in ZIP code 78663?: About 503 people live in the 78663 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.

Source: U.S. Census Bureau (ZIP Code Tabulation Areas, American Community Survey) · Data as of 12/31/2023. ZIP Code Tabulation Areas closely match, but are not identical to, USPS ZIP code delivery areas.