The ZIP Code, Map and Demographics of Round Mountain, TX

78663 is the only ZIP Code for Round Mountain, TX

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Data Last Updated: June 1, 2026
ZIP Code:78663 (Standard)
County:Blanco County, TX
Area Code:830
Time Zone:Central (GMT -06:00)
Local Time:12:00:00 AM
Population:101 (Census Place) [More Demographics]
Statistical Area:None [Learn More]
Coordinates:30.4178, -98.3333
Land Area:108.48 sq miles (ZIP Code)
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Round Mountain, TX has 1 ZIP Code


ZIP CodeTypePopulationPop% of Population% of PopAlias Names
78663Standard815100.00%Cypress Mill,Round Mtn
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Population & Demographics


Round Mountain, TX has 607 residents, with an average household size of 2.3. The gender split is 54.7% male and 45.3% female - about the same as the national split. By age, the top brackets are 30-34 (4.2%) and 35-39 (20.0%). By race, White and Black or African American are the largest groups. Hispanic or Latino (of any race) is 23.2%. Those born outside the United States make up 0.0% (lower than the Nation).

Explore More:Population Over TimeBy Age & GenderBy RaceBy GenderNativity & Citizenship

Source: U.S. Census 2020 Demographics & Housing Characteristics (DHC) and U.S. Census 2011-2024 American Community Survey (ACS) 5-Year Estimates.

There are two kinds of demographics shown in the charts for Round Mountain, TX. Each covers a different geographic boundary and has different criteria for what is included. Learn More

Total Population:815
Total Households:319
Total Housing Units:447
Average Household Size:2.55
Average Family Size:3.22

All ZIP Codes assigned this City name by the USPS.

Total Population:101
Total Households:39
Total Housing Units:59
Average Household Size:2.59
Average Family Size:2.84

Data for the U.S. Census Place.

Population Over Time (with 2010 & 2020 Census Benchmarks)


Line chart of All ZIPs in Round Mountain, TX population estimates from 2011-2024, with markers for the 2010 and 2020 Decennial Census counts to show growth or decline over time. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Group20102011210220132014201520162017201820192020202120222023
Census ACS Population Estimate--720783827975750829913846873782696599607
Decennial Census746------------------815------
Source: U.S. Census 2011-2023 American Community Survey 5-Year Estimates. DP05. DEMOGRAPHIC AND HOUSING ESTIMATES

Population by Age & Gender (Total, Male, Female)


Median Age: 57.7

Male Median Age: 59.1

Female Median Age: 57.2

Line Chart showing the population by Age Group and Gender of all ZIPs in Round Mountain, Texas. One line shows the Total population in that age group, another line shows the Male population for that age group, and the last line shows the Female population for the given age group. A table also provides the same information. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Group< 55-910-1415-1920-2425-2930-3435-3940-4445-4950-5455-5960-6465-6970-7475-7980-8485+
Male1813122911108181719202553472723246
Female17151327101412142625284259484922113
Total352825562124203243444867112957645359
Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)

Population by Race


Pie Chart showing Population by Race for all ZIPs in Round Mountain, Texas. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
White:65676.73%
Black:101.17%
Hispanic:*13115.32%
Asian:121.40%
American Indian:101.17%
Hawaiian:00%
Other:364.21%
Total:855100%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)
* NOTE: Hispanic or Latino is an ethnicity, not a race. This means individuals who identify as Hispanic will also be included in one of the race categories (such as White or Black). As a result, the totals shown here may exceed 100% when Hispanic is displayed alongside racial groups.

Gender Breakdown


Pie chart showing Male vs Demale share of the population. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
GenderCountPercentageMedian Age
Males:38046.63%59.1 years
Females:43553.37%57.2 years
Total:815100%57.7 years

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)

Nativity & Citizenship


Native, born in the United States:55391.10%
Native, born in PR, Island Areas, or abroad:548.90%
Foreign born, naturalized U.S. citizen:00.00%
Foreign born, not a U.S. citizen:00.00%
Total Population:607100%
Total Native Population:607100.00%
Total Foreign-born Population:00.00%
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS
Note: Nativity and Citizenship derived from American Community Survey (ACS) 5-year estimates. Total Population listed here will not match official ZIP Code population totals, which are based on the Decennial Census.

Income & Employment


ZIP Codes in Round Mountain, TX have an average household income of $156,829 (much higher than the State by 105.6%, and much higher than the Nation by 99.7%). Employment participation is much lower than the Nation (63.3%). The unemployment rate is 2.0%, which is much lower than the Nation (5.2%).

Explore More:Income Over TimeHousehold IncomeEmployment StatusBy Occupation

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Tables DP02, DP03, DP04 and DP05.

Median Income Over Time (Household, Family, Nonfamily, Male, Female)


Line Chart showing Median Income Estimates from 2011 until 2024 of Median Household Income, Median Family Income, Median Nonfamily Income, Median Male Income, and Median Female Income for all ZIPs in Round Mountain, Texas. A table also provides the same information. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Income Type2011210220132014201520162017201820192020202120222023
Median Household Income$75,347$75,677$71,971$73,291$73,019$73,344$74,397$78,194$91,413$88,750$97,031$150,593$156,829
Median Family Income$101,000$90,147$79,167$78,536$83,456$81,397$83,281$87,623$110,577$89,688$137,632$150,763$157,222
Median NonFamily Income$27,232$44,107$27,411$45,536$0$0$0$0$0$60,625$0$0$0
Median Male Income$45,156$40,658$40,792$29,522$0$40,365$44,063$0$96,964$97,074$102,083$122,566$114,352
Median Female Income$40,592$41,083$50,078$44,688$0$41,250$50,815$47,264$48,889$48,421$51,860$55,647$60,156
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Average Household Income


Bar Chart showing Average Household Income for all ZIPs in Round Mountain, TX, the U.S. Census Place, Blanco County, the state of Texas, and the United States National Average. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Source: U.S. Census 2019-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Employment Status


Employment status for all ZIPs in Round Mountain, TX: employed, unemployed, and not in the labor force. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Employed:34757.74%
Unemployed:50.83%
Not In Labor Force:24941.43%
Total:601100%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Employment by Occupation (Civilian Employed Population, 16 and Over)


Management, business, science, and arts:16748.13%
Service:3510.09%
Sales and Office:12836.89%
Natural resources, construction, and maintenance:154.32%
Production, transportation, and material moving:20.58%
Total Civilian Employed Population:347100%
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS.

Housing & Affordability


In Round Mountain, TX, the median home value is $178,800 - much lower than the State by 31.3%. Most renters in Round Mountain pay $2,000+ (100.0%). About 0.0% pay under $1,000 and 100.0% pay $2,000+; the under $1,000 share is much lower than the Nation. Of occupied housing, owners make up 66.7% (53.6% have a mortgage) and renters make up 33.3% - owners are higher than the Nation.

Explore More:Compare Home ValueHome Value Over TimeRent & Over TimeHousing Occupancy

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Table DP03, SELECTED ECONOMIC CHARACTERISTICS.

Median Home Value (Comparison)


Bar Chart showing median House Value for all ZIPs in Round Mountain, Texas, the U.S. Census Place, Blanco County, Texas, and the United States National Average. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Median Home Value Over Time (2011-2024)


Group2011210220132014201520162017201820192020202120222023
Median Home Value$121,300$117,800$114,700$112,500$154,000$138,800$0$0$0$0$255,400$178,800$0
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Gross Rent Paid


Less than $500:00.00%
$500 to $999:00.00%
$1,000 to $1,499:00.00%
$1,500 to $1,999:00.00%
$2,000 to $2,499:12.08%
$2,500 to $2,999:00.00%
$3,000 or more:00.00%
No Rent:4797.92%
Total:48100%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table Table DP04. SELECTED HOUSING CHARACTERISTICS

Median Gross Rent Over Time (2011-2024)


Group2011210220132014201520162017201820192020202120222023
Median Rent$821$895$825$500$0$0$0$0$788$0$0$0$0
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Housing Occupancy


Owner Occupied (with mortgage):14144.76%
Owner Occupied (free and clear, no mortgage):12640.00%
Renter Occupied:4815.24%
Total Occupied Housing Units:315100%

Occupied Housing Units:31590.52%
Vacant Housing Units (not graphed):339.48%
Total Housing Units:348100%
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Education, Health & Community


5.3% of adults (25+) have a bachelor-s degree or higher, well below the state rate (33.1%) and well below the national average (35.0%). High school or higher is 75.0%, which is well below the state rate (85.7%). The share of people in poverty is 1.2%, which is markedly below the state rate (10.5%) and below the national rate (8.7%), down 4.3 percentage points since 2011 and down 0.7 percentage points from its 2019 pre-pandemic level.

Explore More:Educational AttainmentHealth InsurancePoverty Over TimeSchool Enrollment

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Tables DP02 and DP03.

Educational Attainment of Adults (25 and Older)


Less than 9th grade:142.43%
9th to 12th grade, no diploma:50.87%
High school graduate (includes equivalency):14425.04%
Some college, no degree:18932.87%
Associate's degree:447.65%
Bachelor's degree:15927.65%
Graduate or professional degree:203.48%
Total:575100%
High school graduate or higher:55696.70%
Bachelor's degree or higher:17931.13%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

Health Insurance Coverage by Type (Private, Public, Uninsured)


Private Insurance:39157.08%
Public Insurance:20029.20%
No Insurance:9413.72%
Total:685100%
Has Health Insurance:59186.28%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Percentage of People in Poverty Over Time (2011-2024)


Group2011210220132014201520162017201820192020202120222023
% of People in Poverty5.5%5.9%2.2%3.4%4.0%3.4%2.9%2.8%1.9%1.2%0.0%0.0%0.0%
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Note: Counts of Families & People in poverty are not published at the ZIP Code level due to small sample sizes. Percentages shown are survey estimates from the American Community Survey (ACS). They may differ from official poverty statistics. The U.S. Census Bureau defines poverty status by comparing a family's or individual's total income with federal poverty thresholds that vary by family size and composition.

School Enrollment by Education Level (Ages 3 and Older)


Nursery School, Preschool:00.00%
Kindergarten:00.00%
Elementary school (grades 1-8):614.29%
High school (grades 9-12):3071.43%
College or graduate school:614.29%
Total:42100%
Early Childhood:00.00%
K-12 (Primary & Secondary School):3685.71%
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

Business & Employment Statistics


Round Mountain supports both business and residential activity. According to the Business Census (2024), there are 32 business establishments, employing about 134 people with an annual payroll of $12,020,000. USPS data shows 433 residential mailboxes and 19 business mailboxes, reflecting local delivery coverage.

# Residential Mailboxes:433Source: USPS
# Business Mailboxes:19Source: USPS
Total Delivery Receptacles:535Source: USPS
Single Family Delivery Units:310Source: USPS
Multi Family Delivery Units:0Source: USPS
# of Businesses:32Source: CBP
1st Quarter Payroll:$2,182,000Source: CBP
Annual Payroll:$12,020,000Source: CBP
# of Employees:134Source: CBP

All ZIP Codes assigned this City name by the USPS.

Geography, Land Area, and Statistical Classifications


Round Mountain, TX is located in Blanco County, within the Metropolitan Statistical Area (CBSA ). It spans 5 of Texas's Congressional Districts (1st,4th,10th,21st, and 31st). This area has a population of 0 people, about 0.0% of whom live in Round Mountain. ZIP Codes here cover 108.479 sq mi of land and a water area of 0.639 sq mi.

CBSA Name:--Source: Census
CBSA Number:--Source: Census
CBSA Type:--Source: Census
CBSA Division:--Source: Census
CBSA Population:0Source: Census
MSA:--Source: Census
PMSA:--Source: Census
Land Area:108.479 sq miSource: Census
Water Area:0.639 sq miSource: Census
Congressional District(s):01,04,10,21,31Source: USPS
Intro Date:< 2004-10Source: ZIP-Codes.com
Place FIPS Code:63476Source: Census
Place Name:Round Mountain town; TexasSource: Census

Sum of all ZIP Codes assigned this City name by the USPS.

Adjacent & Nearby Cities from Round Mountain, TX


  1. Johnson City, TX~7.5 miles
  2. Horseshoe Bay, TX~9.0 miles
  3. Spicewood, TX~12.5 miles
  4. Marble Falls, TX~12.9 miles
  5. Dripping Springs, TX~17.6 miles
  6. Kingsland, TX~17.6 miles
  7. Willow City, TX~19.8 miles
  8. Hye, TX~20.0 miles
  9. Austin, TX~21.5 miles
  10. Leander, TX~21.7 miles
  11. Blanco, TX~22.5 miles
  12. Stonewall, TX~23.0 miles
  13. Buchanan Dam, TX~25.1 miles
  14. Burnet, TX~27.0 miles
  15. Driftwood, TX~27.1 miles
  16. Llano, TX~27.6 miles
  17. Bertram, TX~27.6 miles
  18. Wimberley, TX~29.1 miles
  19. Liberty Hill, TX~30.8 miles
  20. Bluffton, TX~31.1 miles

Sources & References


Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on June 1, 2026.

  1. U.S. Postal Service [Last Updated: 6/1/2026], https://www.usps.com
  2. ZIP-Codes.com Proprietary Data Enhancements [Updated: 6/1/2026], https://www.zip-codes.com
  3. U.S. Census [Updated: Varies], https://www.census.gov
    • U.S. Census Office of Management and Budget [Updated: As Released]
    • U.S. Census 2020 Demographic & Housing Characteristics (DHC) [Decennial] [Updated: 5/25/2023]
    • U.S. Census 2011-2024 American Community Survey 5-year estimates (ACS) [Annually] [Updated: Annually, As Released]
    • U.S. Census Business Patterns [Annually] [Updated: Annually, As Released]
    • U.S. Census American National Standards Institute (ANSI) [Updated: As Released]
  4. U.S. Geological Survey [Updated: Varies], https://www.usgs.gov
  5. Centers for Medicare & Medicaid Services [Updated: Annually, As Released], https://www.cms.gov
  6. National Center for Education Statistics [Updated: 6/1/2026], https://nces.ed.gov