Zip code 78665: Round Rock, Texas

Q: What city is zip code 78665?

78665 is assigned to Round Rock, Texas. The city name is the one the Postal Service prefers for mail addressed to this zip code.

Q: What county is 78665 in?

78665 is in Williamson County, Texas.

Q: What is the population of 78665?

About 66,171 people live in 78665, according to the Census Bureau's American Community Survey.

Q: What is the median household income in 78665?

The median household income in 78665 is $122,680.

Q: What zip codes are near 78665?

The closest zip codes to 78665 are 78664, 78681, 78634, 78627, 78728.

Residential delivery areaWilliamson CountyCentral Time

Population

66,171

Median household income

$123K

U.S. $81K

Median home value

$474K

U.S. $333K

Median rent

$1,938/mo

U.S. $1,413

Median age

35.5

U.S. 38.9

Land area

24 sq mi

2,748 people/sq mi

Boundary is the Census Bureau's ZIP Code Tabulation Area, which closely tracks the postal delivery area.

About 78665

78665 is an urban zip code in Round Rock, Texas (Williamson County), covering 24 sq mi of land. About 66,171 people live here, or 2,748 per square mile. The median resident is 35.5 years old, compared with 38.9 nationally.

The median household earns $122,680 a year, 52% above the national median of $80,734. 4.7% of residents live below the poverty line (U.S.: 12.5%). A typical home is valued at $474,100, or 3.9 years of median household income (U.S.: 4.1 years), which makes homes about as affordable as the national average for local earners. 61% of occupied homes are lived in by their owners, and renters pay a median of $1,938 a month.

54% of adults hold a bachelor's degree or higher (U.S.: 36%). Commuters average 27.8 minutes each way, and 27% of workers work from home. The most common jobs among working residents are in management; office and administrative support; and computer and math (tech). 34% of households speak a language other than English at home, most often Spanish.

How 78665 compares

Sorted from highest to lowest national percentile

Tech workers9.9%
96th
U.S. 3.8% · TX 3.8%55th of 1,810 in TX
Diversity index70.5
94th
U.S. 61.4 · TX 67.182nd of 1,818 in TX
Broadband access97.3%
94th
StrengthU.S. 91% · TX 91.4%154th of 1,792 in TX
Population66,171
92nd
U.S. 334,922,499 · TX 30,188,42460th of 1,818 in TX
Work from home27%
91st
U.S. 15.1% · TX 14.4%101st of 1,810 in TX
Median household income$122,680
86th
StrengthU.S. $80,734 · TX $78,476115th of 1,712 in TX
Bachelor's degree or higher53.6%
83rd
StrengthU.S. 35.7% · TX 33.8%167th of 1,811 in TX
Per capita income$56,191
81st
StrengthU.S. $44,673 · TX $40,752176th of 1,813 in TX
Median gross rent$1,938
81st
U.S. $1,413 · TX $1,403102nd of 1,511 in TX
Median earnings per worker$63,253
80th
StrengthU.S. $49,666 · TX $47,575222nd of 1,794 in TX
Residents under 1825.5%
78th
U.S. 22% · TX 25%705th of 1,818 in TX
Veterans7.9%
76th
U.S. 6.2% · TX 6.2%599th of 1,818 in TX
Median home value$474,100
72nd
U.S. $332,700 · TX $283,800139th of 1,679 in TX
Foreign-born residents17.6%
70th
U.S. 14.1% · TX 17.6%419th of 1,818 in TX
Population density2,748/sq mi
65th
U.S. 95/sq mi · TX 116/sq mi358th of 1,818 in TX
Government workers15.4%
62nd
U.S. 14.5% · TX 14.1%865th of 1,810 in TX
Average commute27.8 min
61st
U.S. 26.4 min · TX 26.7 min738th of 1,738 in TX
Uninsured rate6.7%
49th
U.S. 8.4% · TX 17.1%1,609th of 1,808 in TX
Healthcare workers9.1%
44th
U.S. 9.7% · TX 8.6%700th of 1,810 in TX
Rent-burdened renters48.2%
40th
U.S. 51.1% · TX 51.7%842nd of 1,692 in TX
Housing vacancy5.6%
39th
U.S. 10.1% · TX 9.4%1,483rd of 1,794 in TX
Homeownership rate61.4%
34th
U.S. 65.2% · TX 62.6%1,346th of 1,792 in TX
Self-employed workers8.1%
34th
U.S. 10% · TX 10.5%1,358th of 1,810 in TX
Income inequality (Gini)0.417
34th
U.S. 0.483 · TX 0.4781,081st of 1,785 in TX
Median age35.5
24th
U.S. 38.9 · TX 35.61,211th of 1,817 in TX
Unemployment rate3.4%
23rd
U.S. 5.2% · TX 5.3%1,191st of 1,810 in TX
Poverty rate4.7%
10th
StrengthU.S. 12.5% · TX 13.8%1,587th of 1,794 in TX
Residents 65 and older10.4%
10th
U.S. 17.2% · TX 13.4%1,496th of 1,818 in TX

Measure	78665	Williamson	TX	U.S.	National percentile	Rank in TX
Tech workers	9.9%	9.6%	3.8%	3.8%	96th	55th of 1,810
Diversity index	70.5	63.8	67.1	61.4	94th	82nd of 1,818
Broadband accessStrength	97.3%	95.8%	91.4%	91%	94th	154th of 1,792
Population	66,171	672,688	30,188,424	334,922,499	92nd	60th of 1,818
Work from home	27%	25.4%	14.4%	15.1%	91st	101st of 1,810
Median household incomeStrength	$122,680	$111,340	$78,476	$80,734	86th	115th of 1,712
Bachelor's degree or higherStrength	53.6%	48.4%	33.8%	35.7%	83rd	167th of 1,811
Per capita incomeStrength	$56,191	$53,505	$40,752	$44,673	81st	176th of 1,813
Median gross rent	$1,938	$1,796	$1,403	$1,413	81st	102nd of 1,511
Median earnings per workerStrength	$63,253	$61,236	$47,575	$49,666	80th	222nd of 1,794
Residents under 18	25.5%	24.1%	25%	22%	78th	705th of 1,818
Veterans	7.9%	7.6%	6.2%	6.2%	76th	599th of 1,818
Median home value	$474,100	$447,000	$283,800	$332,700	72nd	139th of 1,679
Foreign-born residents	17.6%	16.2%	17.6%	14.1%	70th	419th of 1,818
Population density	2,748/sq mi	603/sq mi	116/sq mi	95/sq mi	65th	358th of 1,818
Government workers	15.4%	13.9%	14.1%	14.5%	62nd	865th of 1,810
Average commute	27.8 min	27.9 min	26.7 min	26.4 min	61st	738th of 1,738
Uninsured rate	6.7%	9.8%	17.1%	8.4%	49th	1,609th of 1,808
Healthcare workers	9.1%	7.6%	8.6%	9.7%	44th	700th of 1,810
Rent-burdened renters	48.2%	48%	51.7%	51.1%	40th	842nd of 1,692
Housing vacancy	5.6%	3.9%	9.4%	10.1%	39th	1,483rd of 1,794
Homeownership rate	61.4%	66.4%	62.6%	65.2%	34th	1,346th of 1,792
Self-employed workers	8.1%	9.5%	10.5%	10%	34th	1,358th of 1,810
Income inequality (Gini)	0.417	0.415	0.478	0.483	34th	1,081st of 1,785
Median age	35.5	37.3	35.6	38.9	24th	1,211th of 1,817
Unemployment rate	3.4%	3.9%	5.3%	5.2%	23rd	1,191st of 1,810
Poverty rateStrength	4.7%	6.4%	13.8%	12.5%	10th	1,587th of 1,794
Residents 65 and older	10.4%	12.9%	13.4%	17.2%	10th	1,496th of 1,818

The percentile is the share of Americans who live in a zip code with a lower value, so the 50th percentile is typical. Rank 1 is the highest value in the state. Both include zip codes with at least 100 residents. Strengths and weaknesses mark measures in the best or worst fifth nationally, where higher or lower is clearly better (income, poverty, education, commute, broadband, insurance and similar). Measures like age or density are left unmarked.

People

Age

Under 5

19%

5–17

18–24

14%

25–34

17%

35–44

15%

45–54

55–64

65–74

75+

Median age

35.5

Under 18

25.5%

65 and over

10.4%

Race and ethnicity

White45%
Black11%
Hispanic24%
Asian11%
Native American0.1%
Pacific Islander0.5%
Other0.8%
Multiracial6%

Diversity index

70.5

U.S. 61.4

Foreign-born

17.6%

U.S. 14.1%

Born in state

43%

Language spoken at home (households)

English only

66%

Spanish

18%

Other Indo-European

Asian / Pacific

Other

Households

Households: 24,162
Average household size: 2.7
Family households: 72.4%
Married couples: 57.4%
Living alone: 21.8%
Veterans (of adults): 7.9%
Male / female: 50% / 50%

Income and poverty

Household income distribution

<$25k

$25–50k

10%

$50–75k

10%

$75–100k

13%

$100–150k

21%

$150–200k

16%

$200k+

23%

Median household income

78665

$122,680

Williamson Co.

$111,340

Texas

$78,476

United States

$80,734

Per capita income

$56,191

U.S. $44,673

Poverty rate

4.7%

U.S. 12.5%

Households earning $150K+

38.3%

U.S. 23%

Income inequality (Gini)

0.417

U.S. 0.483

Housing

Median home value

78665

$474,100

Williamson Co.

$447,000

Texas

$283,800

United States

$332,700

Median gross rent

78665

$1,938

Williamson Co.

$1,796

Texas

$1,403

United States

$1,413

Types of housing

Single-family

73%

2–4 units

5–19 units

10%

20+ units

15%

Mobile home

0.1%

Boat, RV, van

Housing units: 25,598
Owner-occupied: 61.4%
Vacant: 5.6%
Median year built: 2010
Median rooms: 6
Renters paying 30%+ of income: 48.2%
Renters paying 50%+ of income: 23.2%
Home value to income: 3.9× (U.S. 4.1×)

Work and commute

How people get to work

Drove alone

63%

Carpooled

Transit

0.1%

Walked

0.4%

Bicycle

0.1%

Worked from home

27%

Other

Commute time (one way)

<10 min

10–19

22%

20–29

22%

30–44

30%

45–59

11%

60+

Average commute

27.8 min

U.S. 26.4 min

Unemployment

3.4%

U.S. 5.2%

In labor force

73.2%

U.S. 63.5%

Jobs and careers

What employed residents do, wherever they work

Occupations

Management

15%

Office and admin

12%

Computer and math

10%

Sales

10%

Healthcare

Business and finance

Education

Transportation and moving

Construction and repair

Engineering and science

Food service

Cleaning and personal care

Production

Arts, media and sports

Police and fire

Legal and social services

Farming, fishing and forestry

0.0%

Industries

Professional and technical services

15%

Health care and social assistance

14%

Retail

10%

Manufacturing

Education

Finance, insurance and real estate

Public administration

Restaurants and hotels

Transportation, warehousing and utilities

Construction

Admin, support and management

Other services

Wholesale

Information

Arts and recreation

Agriculture and mining

0.1%

Median earnings per worker

$63,253

U.S. $49,666

Self-employed

8.1%

U.S. 10%

Government workers

15.4%

U.S. 14.5%

Nonprofit workers

7.1%

U.S. 8.8%

Median earnings by type of work

Type of work	78665	U.S.
Management, business, science and arts	$88,120	$74,888
Service	$31,426	$26,804
Sales and office	$48,966	$40,476
Construction and maintenance	$62,560	$49,199
Production and transportation	$36,667	$39,989

Education, internet and health coverage

Highest education (adults 25+)

No diploma

High school

16%

Some college

19%

Associate's

Bachelor's

32%

Graduate

21%

High school graduate or higher: 96.6%
Bachelor's degree or higher: 53.6%
Graduate or professional degree: 21.4%
Households with broadband: 97.3%
Cable, fiber or DSL: 90.2%
No internet access: 1.6%
Without health insurance: 6.7%
Limited-English households: 2.8%

Geography

City (USPS): Round Rock
State: Texas
County: Williamson County
Center point: 30.5489° N, 97.6362° W
Land area: 24 sq mi
Water area: 0.4 sq mi
Time zone: Central Time (UTC-6, UTC-5 in summer)
Zip type: Residential delivery area

Cities and towns within this zip

Round Rock61% of zip

Census places overlapping the zip's area. Mail may use a different city name than the municipality.

Zip codes near 78665

Search by radius

Zip	City	Distance	Population	IncomeMedian income	Home value
78664	Round Rock, TX	3.1 mi	62,060	$87,417	$358,200
78681	Round Rock, TX	4.8 mi	56,691	$137,819	$497,300
78634	Hutto, TX	5.5 mi	46,413	$114,426	$375,200
78627	Georgetown, TX · PO box	6.3 mi	—	—	—
78728	Austin, TX	7.2 mi	26,777	$75,243	$437,000
78764	Austin, TX · PO box	7.3 mi	—	—	—
78691	Pflugerville, TX · PO box	7.6 mi	—	—	—
78626	Georgetown, TX	7.6 mi	48,072	$100,431	$387,700
78680	Round Rock, TX · PO box	7.7 mi	—	—	—
78682	Round Rock, TX · PO box	7.7 mi	—	—	—
78683	Round Rock, TX · PO box	7.7 mi	—	—	—
78660	Pflugerville, TX	7.9 mi	124,834	$113,205	$411,900

Zip codes like 78665 elsewhere

Matched on income, home values, age, density, education, housing and commuting

Questions about 78665

What city is zip code 78665?

78665 is assigned to Round Rock, Texas. The city name is the one the Postal Service prefers for mail addressed to this zip code.

What county is 78665 in?

78665 is in Williamson County, Texas.

What is the population of 78665?

About 66,171 people live in 78665, according to the Census Bureau's American Community Survey.

What time zone is 78665 in?

78665 is in Central Time.

What is the median household income in 78665?

The median household income in 78665 is $122,680.

What zip codes are near 78665?

The closest zip codes to 78665 are 78664, 78681, 78634, 78627, 78728.

Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 78665, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.