PlainZIP

Round Rock, TX · standard

ZIP Code 78664

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

52,932
1,233/sq mi
$87,417
Median income
$358,200
Median home value
36.4%
Bachelor's or higher

The verdict

Round Rock pairs an above-median household income with upper-quartile home values, in a low-density, mixed-tenure and unusually populous area.

Top 29%
household income, US ZIPs
Top 25%
home value, US ZIPs
1,233
people per sq mi
54%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 78664 against every reporting US ZIP.

ZIP code 78664 is a densely settled ZIP (a standard USPS delivery area) in Round Rock, Williamson County, Texas, with 52,932 residents across 42.9 square miles, a density of 1,233 people per square mile, in the Chicago time zone.

ZIP 78664 lands in the middle-income range, with a median household income of $87,417 (16% above the Texas average), while per-capita income is $43,876. 10.2% of residents live below the poverty line, and the unemployment rate reads 4.4%. On housing, the median home value is $358,200 (45% above the state average) with median rent at $1,692 per month, and 53.7% of occupied units are owner-occupied.

A solid share of residents have a four-year degree: 36.4% of adults hold a bachelor's degree or higher, the median age is 35.1, and the average commute is 26 minutes. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Williamson County, so you can benchmark 78664 against its immediate geography rather than a national average alone.

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 78664

Top 5 sectors by establishment count in Round Rock, TX

Which industries have the most business establishments in ZIP 78664.

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 78664, 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

52,932

Population

42.9

Area (sq mi)

1,233

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 78664?

35.1

Median Age

48.4%

Male

51.6%

Female

18.1%

Foreign-Born

White 47.6%
African American 14.1%
Asian 6.0%
American Indian or Alaska Native 0.9%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 25.0%
Hispanic or Latino 35.8%

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?

$87,417

Median Household Income

+16% vs state

$43,876

Per Capita Income

10.2%

Poverty Rate

4.4%

Unemployment Rate

25.6 min

Mean Commute Time

How ZIP 78664 ranks nationally

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

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

$87,417 Top 29% higher than 71% 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%). This entry sits in this band. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $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 58.6%
Bachelor's Degree or Higher 36.4%

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

What does housing look like?

24,497

Total Housing Units

23,484

Occupied Units

1,013

Vacant Units

2.62

Avg Household Size

Occupancy Type

Owner 53.7%
Renter 46.3%

$358,200

Median Home Value

+45% vs state

$1,692

Median Rent

1997

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

-2.5%

YoY Change (2024)

304

HPI Index (2000 = 100)

+204%

Total Change Since 2000

Home values in ZIP 78664 have decreased 2.5% over the past year (2024). Since 2000, this ZIP has seen +204% cumulative appreciation.

Year Annual Change HPI Index
2020 +5.6% 211
2021 +28.9% 271
2022 +25.8% 341
2023 -8.6% 312
2024 -2.5% 304

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 1,841 business establishments in ZIP 78664, employing approximately 28,470 people with a combined annual payroll of $1,649,775,000.

1,841

Businesses

28,470

Employees

$1.6B

Annual Payroll

18

Industry Sectors

Industry Establishments % of Total
Retail trade 284 15.4%
Professional, scientific, and technical services 264 14.3%
Health care and social assistance 202 11.0%
Accommodation and food services 188 10.2%
Construction 176 9.6%
Other services (except public administration) 157 8.5%
Finance and insurance 110 6.0%
Real estate and rental and leasing 106 5.8%
Administrative and support and waste management and remediation services 87 4.7%
Wholesale trade 62 3.4%
Transportation and warehousing 49 2.7%
Manufacturing 40 2.2%
Information 38 2.1%
Arts, entertainment, and recreation 32 1.7%
Educational services 31 1.7%
Management of companies and enterprises 8 0.4%
Utilities 3 0.2%
Industries not classified 3 0.2%

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 78664 vs 78665 →

ZIP 78664 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 78664 ranks #2 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 78664 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 78664 ranks #8 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
78665 Round Rock, TX 35,985 2.8 mi
78728 Austin, TX 20,299 4.2 mi
78681 Round Rock, TX 50,606 5.1 mi
78660 Pflugerville, TX 68,789 5.2 mi
78717 Austin, TX 22,538 6.5 mi
78727 Austin, TX 26,689 6.7 mi
78754 Austin, TX 15,036 10.3 mi
78753 Austin, TX 49,301 8.6 mi
78634 Hutto, TX 22,791 7.1 mi
78729 Austin, TX 27,108 7.3 mi

More ZIP Codes in Williamson County

78613 standard
Cedar Park, TX
Pop: 65,099
78681 standard
Round Rock, TX
Pop: 50,606
78641 standard
Leander, TX
Pop: 44,295
78665 standard
Round Rock, TX
Pop: 35,985
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 78664 in? ▼
ZIP code 78664 (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 78664? ▼
ZIP code 78664 in Round Rock, TX has a population of 52,932 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 78664? ▼
The median household income in ZIP 78664 is $87,417, which is 15% above the national average of $76,288.
What is the average home value in ZIP 78664? ▼
The median home value in ZIP 78664 is $358,200, which is 29% above the national average of $278,155.
What is the demographic makeup of ZIP 78664? ▼
The largest racial group in ZIP 78664 is White at 47.6%. Hispanic or Latino residents make up 35.8% of the population.
How many businesses are in ZIP code 78664? ▼
ZIP code 78664 has 1,841 business establishments employing approximately 28,470 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 78664? ▼
The top industries by establishment count in ZIP 78664 are: Retail trade (284), Professional, scientific, and technical services (264), Health care and social assistance (202). There are 18 industry sectors represented in total.
How have home values changed in ZIP code 78664? ▼
According to the FHFA House Price Index, home values in ZIP 78664 decreased by 2.5% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 204%. 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 78664? ▼
In ZIP code 78664, 58.6% of residents aged 25+ have a high school diploma or higher, and 36.4% 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 78664? ▼
The mean commute time for workers in ZIP code 78664 is 25.6 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend less time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 78664? ▼
In ZIP code 78664, approximately 53.7% of occupied housing units are owner-occupied and 46.3% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 78664? ▼
The poverty rate in ZIP code 78664 is 10.2% 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.