Round Rock, TX · standard
ZIP Code 78665
Williamson County, Texas - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 35,985
- 741/sq mi High-density area
- $122,680
- Median income Above-median income area
- $474,100
- Median home value Above-median home value
- 53.6%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
Round Rock pairs a top-decile household income with upper-quartile home values, in a low-density, homeowner-dominated area.
- Top 9%
- household income, US ZIPs
- Top 14%
- home value, US ZIPs
- 741
- people per sq mi
- 61%
- owner-occupied homes
Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 78665 against every reporting US ZIP.
FHFA HPI release change
What changed in the latest House Price Index year
- FHFA House Price Index values in ZIP 78665 (Round Rock, TX) fell -5.5% from 2023 to 2024. The all-transactions index moved from 281.9 in 2023 to 266.4 in 2024 (2000 = 100).
ZIP code 78665 is a densely settled ZIP (a standard USPS delivery area) in Round Rock, Williamson County, Texas, with 35,985 residents across 48.6 square miles, a density of 741 people per square mile, in the Chicago time zone.
ZIP 78665 skews affluent, with a median household income of $122,680 (62% above the average Texas ZIP), while per-capita income is $56,191. Both reported hardship measures are comparatively low in absolute terms: poverty is 4.7% and unemployment is 3.4%. Housing is both higher-cost and owner-heavy: median home value is $474,100 (92% above the average Texas ZIP), while 61.4% of occupied homes are owner-occupied and median rent is $1,938.
This is a highly-educated ZIP: 53.6% of adults hold a bachelor's degree or higher, the median age is 35.5, and the average commute is 28 minutes. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in Williamson County, so 78665 can be compared with both its immediate and county-level context.
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 78665
Top 5 sectors by establishment count in Round Rock, TX
Which industries have the most business establishments in ZIP 78665.
- Professional, scientific, and technical services
Professional, scientific, and technical services
163 establishments
- Health care and social assistance
Health care and social assistance
145 establishments
- Construction
Construction
101 establishments
- Other services (except public administration)
Other services (except public administration)
94 establishments
- Accommodation and food services
Accommodation and food services
90 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, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 78665, Round Rock, 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
35,985
Population
48.6
Area (sq mi)
741
People / sq mi
Chicago
Time Zone
standard
ZIP Type
Who lives in ZIP 78665?
35.5
Median Age
50.3%
Male
49.7%
Female
17.6%
Foreign-Born
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?
$122,680
Median Household Income
+62% vs state ZIP avg
$56,191
Per Capita Income
4.7%
Poverty Rate
3.4%
Unemployment Rate
27.8 min
Mean Commute Time
How ZIP 78665 ranks nationally
Round Rock, TX household income vs. every US ZIP code
Median household income, the full national distribution, with this ZIP marked
$122,680 Top 9% higher than 91% of 30,318 US ZIPs
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?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
25,598housing units
25,598
Total Housing Units
24,162
Occupied Units
1,436
Vacant Units
2.73
Avg Household Size
Occupancy Type
$474,100
Median Home Value
+92% vs state ZIP avg
$1,938
Median Rent
2010
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How have home values changed over time?
FHFA House Price Index, annual appreciation data based on repeat sales and appraisals
-5.5%
YoY Change (2024)
266
HPI Index (2000 = 100)
+166%
Total Change Since 2000
Home values in ZIP 78665 have decreased 5.5% over the past year (2024). Since 2000, this ZIP has seen +166% cumulative appreciation.
| Year | Annual Change | HPI Index |
|---|---|---|
| 2020 | +3.3% | 188 |
| 2021 | +26.1% | 237 |
| 2022 | +24.0% | 295 |
| 2023 | -4.3% | 282 |
| 2024 | -5.5% | 266 |
Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.
What businesses operate in this ZIP?
Census Bureau data shows 981 business establishments in ZIP 78665, employing approximately 16,807 people with a combined annual payroll of $949,925,000.
981
Businesses
16,807
Employees
$949.9M
Annual Payroll
15
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Professional, scientific, and technical services | 163 | 16.6% |
| Health care and social assistance | 145 | 14.8% |
| Construction | 101 | 10.3% |
| Other services (except public administration) | 94 | 9.6% |
| Accommodation and food services | 90 | 9.2% |
| Retail trade | 83 | 8.5% |
| Administrative and support and waste management and remediation services | 67 | 6.8% |
| Real estate and rental and leasing | 60 | 6.1% |
| Finance and insurance | 40 | 4.1% |
| Wholesale trade | 31 | 3.2% |
| Manufacturing | 24 | 2.5% |
| Transportation and warehousing | 23 | 2.3% |
| Information | 20 | 2.0% |
| Educational services | 19 | 1.9% |
| Arts, entertainment, and recreation | 17 | 1.7% |
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 78665 vs 78664 →
ZIP 78665 vs its nearest neighbors, by population
Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 78660
Pflugerville (78660)
68,789 residents
- 78664
Round Rock (78664)
52,932 residents
- 78681
Round Rock (78681)
50,606 residents
- 78665
Round Rock (78665)
35,985 residents
- 78729 27,108
Austin (78729)
27,108 residents
- 78727 26,689
Austin (78727)
26,689 residents
- 78626 25,996
Georgetown (78626)
25,996 residents
- 78628 23,727
Georgetown (78628)
23,727 residents
- 78634 22,791
Hutto (78634)
22,791 residents
What this shows Among its immediate neighbors, ZIP 78665 ranks #4 by population - useful context the national average alone can't give.
ZIP 78665 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 78717
Austin (78717)
$145,325 median income
- 78681
Round Rock (78681)
$137,819 median income
- 78628
Georgetown (78628)
$125,635 median income
- 78665
Round Rock (78665)
$122,680 median income
- 78634
Hutto (78634)
$114,426 median income
- 78660
Pflugerville (78660)
$113,205 median income
- 78727
Austin (78727)
$110,379 median income
- 78626
Georgetown (78626)
$100,431 median income
- 78664
Round Rock (78664)
$87,417 median income
What this shows By household income, ZIP 78665 ranks #4 of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.
| ZIP Code | City | Population | Distance |
|---|---|---|---|
| 78664 | Round Rock, TX | 52,932 | 2.8 mi |
| 78681 | Round Rock, TX | 50,606 | 4.9 mi |
| 78634 | Hutto, TX | 22,791 | 6.0 mi |
| 78728 | Austin, TX | 20,299 | 6.7 mi |
| 78660 | Pflugerville, TX | 68,789 | 7.6 mi |
| 78717 | Austin, TX | 22,538 | 7.6 mi |
| 78626 | Georgetown, TX | 25,996 | 8.8 mi |
| 78727 | Austin, TX | 26,689 | 9.1 mi |
| 78729 | Austin, TX | 27,108 | 9.0 mi |
| 78628 | Georgetown, TX | 23,727 | 9.2 mi |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 78665, both outside TX so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (35,985 here; floor ≥1,000).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Williamson County
Related Areas
Frequently Asked Questions
What county is ZIP code 78665 in?
ZIP code 78665 (Round Rock) is located in Williamson County, Texas. Williamson County contains multiple ZIP codes, see the full list at /counties/williamson-tx.
What is the population of ZIP code 78665?
ZIP code 78665 in Round Rock, TX has a population of 35,985 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 78665?
The median household income in ZIP 78665 is $122,680, which is 61% above the national average of $76,288.
What is the average home value in ZIP 78665?
The median home value in ZIP 78665 is $474,100, which is 70% above the national average of $278,155.
What is the demographic makeup of ZIP 78665?
The largest racial group in ZIP 78665 is White at 49.1%. Hispanic or Latino residents make up 24.3% of the population.
How many businesses are in ZIP code 78665?
ZIP code 78665 has 981 business establishments employing approximately 16,807 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 78665?
The top industries by establishment count in ZIP 78665 are: Professional, scientific, and technical services (163), Health care and social assistance (145), Construction (101). There are 15 industry sectors represented in total.
How have home values changed in ZIP code 78665?
According to the FHFA House Price Index, home values in ZIP 78665 decreased by 5.5% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 166%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 78665?
In ZIP code 78665, 69.3% of residents aged 25+ have a high school diploma or higher, and 53.6% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the average commute time in ZIP 78665?
The mean commute time for workers in ZIP code 78665 is 27.8 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend more time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 78665?
In ZIP code 78665, approximately 61.4% of occupied housing units are owner-occupied and 38.6% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 78665?
The poverty rate in ZIP code 78665 is 4.7% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.
Related
Take this with you
What to do with ZIP 78665's numbers, next.
- See how ZIP 78665 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Round Rock, TX ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
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ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.