PlainZIP

Round Mountain, TX · standard

ZIP Code 78663

Blanco County, Texas - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

746
2/sq mi
$168,125
Median income
$356,800
Median home value
42.7%
Bachelor's or higher

The verdict

Round Mountain pairs a top-decile household income with upper-quartile home values, in a rural, homeowner-dominated area.

Top 2%
household income, US ZIPs
Top 25%
home value, US ZIPs
2
people per sq mi
83%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 78663 against every reporting US ZIP.

ZIP code 78663 is a sparsely populated ZIP (a standard USPS delivery area) in Round Mountain, Blanco County, Texas, home to just 746 residents across 324.3 square miles, a density of 2 people per square mile, in the Chicago time zone.

ZIP 78663 skews affluent, with a median household income of $168,125 (122% above the Texas average), while per-capita income is $100,059. Local economic indicators show a 3.6% poverty rate alongside 0.4% unemployment. Housing costs here run $356,800 for a typical home value (44% above the state average), with rent averaging $1,688 a month; 83.0% of homes are owner-occupied.

A solid share of residents have a four-year degree: 42.7% of adults hold a bachelor's degree or higher, the median age is 65.4, and the average commute is -. To put 78663 in local context, 2 ZIP codes within roughly 10 miles appear further down this page alongside 3 additional ZIPs in Blanco County, for a geography-aware comparison.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 78663

Top 5 sectors by establishment count in Round Mountain, TX

Which industries have the most business establishments in ZIP 78663.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 78663, Round Mountain, TX · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

746

Population

324.3

Area (sq mi)

2

People / sq mi

Chicago

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 78663?

65.4

Median Age

60.0%

Male

40.0%

Female

0.8%

Foreign-Born

White 92.8%
African American 0.0%
Asian 0.0%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 0.2%
Hispanic or Latino 7.6%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$168,125

Median Household Income

+122% vs state

$100,059

Per Capita Income

3.6%

Poverty Rate

0.4%

Unemployment Rate

How ZIP 78663 ranks nationally

Round Mountain, TX household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$168,125 Top 2% higher than 98% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Below this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Below this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Below this entry. $140,000–$160,000: 686 US ZIPs (2%). Below this entry. $160,000–$180,000: 364 US ZIPs (1%). This entry sits in this band. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 47.7%
Bachelor's Degree or Higher 42.7%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

288

Total Housing Units

276

Occupied Units

12

Vacant Units

1.82

Avg Household Size

Occupancy Type

Owner 83.0%
Renter 17.0%

$356,800

Median Home Value

+44% vs state

$1,688

Median Rent

2001

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What businesses operate in this ZIP?

Census Bureau data shows 32 business establishments in ZIP 78663, employing approximately 134 people with a combined annual payroll of $12,020,000.

32

Businesses

134

Employees

$12.0M

Annual Payroll

6

Industry Sectors

Industry Establishments % of Total
Construction 9 28.1%
Professional, scientific, and technical services 5 15.6%
Retail trade 4 12.5%
Manufacturing 3 9.4%
Wholesale trade 3 9.4%
Finance and insurance 3 9.4%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 78663 vs 78657 →

ZIP 78663 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 78663 ranks #3 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 78663 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 78663 ranks the highest of 3 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
78657 Horseshoe Bay, TX 5,509 8.0 mi
78636 Johnson City, TX 3,749 9.4 mi

More ZIP Codes in Blanco County

78606 standard
Blanco, TX
Pop: 5,205
78636 standard
Johnson City, TX
Pop: 3,749
78635 standard
Hye, TX
Pop: 149

Related Areas

Blanco County Round Mountain, TX Texas

Frequently Asked Questions

What county is ZIP code 78663 in? ▼
ZIP code 78663 (Round Mountain) is located in Blanco County, Texas. Blanco County contains multiple ZIP codes, see the full list at /counties/blanco-tx.
What is the population of ZIP code 78663? ▼
ZIP code 78663 in Round Mountain, TX has a population of 746 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 78663? ▼
The median household income in ZIP 78663 is $168,125, which is 120% above the national average of $76,288.
What is the average home value in ZIP 78663? ▼
The median home value in ZIP 78663 is $356,800, which is 28% above the national average of $278,155.
What is the demographic makeup of ZIP 78663? ▼
The largest racial group in ZIP 78663 is White at 92.8%. Hispanic or Latino residents make up 7.6% of the population.
How many businesses are in ZIP code 78663? ▼
ZIP code 78663 has 32 business establishments employing approximately 134 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 78663? ▼
The top industries by establishment count in ZIP 78663 are: Construction (9), Professional, scientific, and technical services (5), Retail trade (4). There are 6 industry sectors represented in total.
What is the education level in ZIP code 78663? ▼
In ZIP code 78663, 47.7% of residents aged 25+ have a high school diploma or higher, and 42.7% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 78663? ▼
In ZIP code 78663, approximately 83.0% of occupied housing units are owner-occupied and 17.0% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 78663? ▼
The poverty rate in ZIP code 78663 is 3.6% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.