PlainZIP

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
$122,680
Median income
$474,100
Median home value
53.6%
Bachelor's or higher

The verdict

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.

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 Texas average), while per-capita income is $56,191. Poverty here runs at 4.7%, with unemployment measured at 3.4%. The typical home here is valued at $474,100 (92% above the state average); renters pay a median of $1,938 monthly, and 61.4% of units are owner-occupied.

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. To put 78665 in local context, 10 ZIP codes within roughly 10 miles appear further down this page alongside 6 additional ZIPs in Williamson 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 78665

Top 5 sectors by establishment count in Round Rock, TX

Which industries have the most business establishments in ZIP 78665.

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 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

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 78665?

35.5

Median Age

50.3%

Male

49.7%

Female

17.6%

Foreign-Born

White 49.1%
African American 11.8%
Asian 11.6%
American Indian or Alaska Native 0.5%
Native Hawaiian or Pacific Islander 0.5%
Two or More Ethnicities 20.2%
Hispanic or Latino 24.3%

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

$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

$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%). This entry sits in this band. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $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 69.3%
Bachelor's Degree or Higher 53.6%

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

What does housing look like?

25,598

Total Housing Units

24,162

Occupied Units

1,436

Vacant Units

2.73

Avg Household Size

Occupancy Type

Owner 61.4%
Renter 38.6%

$474,100

Median Home Value

+92% vs state

$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.

residents

What this shows Among its immediate neighbors, ZIP 78665 ranks #4 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 78665 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 78665 ranks #4 of 9 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
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

More ZIP Codes in Williamson County

78613 standard
Cedar Park, TX
Pop: 65,099
78664 standard
Round Rock, TX
Pop: 52,932
78681 standard
Round Rock, TX
Pop: 50,606
78641 standard
Leander, TX
Pop: 44,295
78729 standard
Austin, TX
Pop: 27,108
78626 standard
Georgetown, TX
Pop: 25,996

Related Areas

Williamson County Round Rock, TX Texas

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.

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