Round Rock ZIP Code List — Williamson County, TX

There are 6 unique ZIP codes in Round Rock, Texas. Area code: 512/737.

ZIP codes

63.88

sq mi land

0.59

sq mi water

512/737

area code

Round Rock, TX ZIP code map

About Round Rock, TX

Round Rock, Texas, is a vibrant city located in Williamson County. Known for its friendly atmosphere and family-oriented community, it combines suburban charm with urban conveniences. The city is recognized for its growth and development, making it an attractive place for both residents and businesses.

Location & geography

Situated just north of Austin, Round Rock is approximately 20 miles from the Texas capital. It is bordered by several other cities, including Georgetown to the north (about 10 miles away), Pflugerville to the east (around 8 miles), and Cedar Park to the southwest (approximately 15 miles). The city encompasses a total land area of 87.07 square miles, with an additional 0.73 square miles of water, featuring a mix of rolling terrains and charming waterways.

Community & economy

Round Rock boasts a diverse and welcoming community, characterized by its family-friendly neighborhoods and bustling local businesses. Key industries in the area include technology, healthcare, and education, which contribute significantly to the city's economy. Residents enjoy a high quality of life, with numerous parks, recreational facilities, and community events that bring people together.

Transportation

The city is well-connected through major highways such as Interstate 35 and State Highway 45, making commuting to nearby cities easy. The nearest airports are Austin-Bergstrom International Airport, located roughly 25 miles to the south, and the smaller Georgetown Municipal Airport just 15 miles to the north. Public transportation options are also available, enhancing accessibility for residents.

History

Round Rock was officially founded in the mid-1800s and has since transformed into a thriving city. Historically significant for its role in the railroad industry, the city became a key trade hub in the region. Over the years, Round Rock has witnessed rapid growth and development, especially in technology and education sectors.

Did you know?

One surprising fact about Round Rock is that it is home to a historic 14-foot high granite rock which gave the city its name. Additionally, the city is famous for being the location of the Round Rock Donuts, which is a popular destination for locals and visitors alike.

ZIP codes for Round Rock, TX (6)

ZIP code	City	County	Map
78664	Round Rock	Williamson	View map
78665	Round Rock	Williamson	View map
78680	Round Rock	Williamson	View map
78681	Round Rock	Williamson	View map
78682	Round Rock	Williamson	View map
78683	Round Rock	Williamson	View map

Demographics & statistics

181,568

Population

36.4

Median age

$106,540

Median household income

$46,435

Per capita income

$360,667

Median home value

$1,698

Median monthly rent

64.8%

Home ownership

6.6%

Poverty rate

3.8%

Unemployment

44,926

Housing units

46.2%

Bachelor's or higher

Age distribution

Male Female

5,586

Under 5

5,673

6,633

5–9

6,736

7,117

10–14

7,228

6,761

15–19

6,866

5,476

20–24

5,562

11,971

25–34

12,158

15,227

35–44

15,465

13,105

45–54

13,309

4,903

55–59

4,980

4,267

60–64

4,333

5,900

65–74

5,991

2,275

75–84

2,310

861

85+

875

← Male

Female →

Age summary

Group	Count	%
Under 18	47,641	26.3%
18 and over	133,927	73.7%
65 and over	18,212	10.1%
Median age	36.4 years

Race & ethnicity

White 54.3%

Two or more races 12.5%

Hispanic or Latino 12.4%

Black or African American 9.2%

Asian 7.5%

Other race 3.5%

American Indian / Alaska Native 0.4%

Native Hawaiian / Pacific Islander 0.2%

Group	Count	%
White	112,458	54.3%
Two or more races	25,973	12.5%
Hispanic or Latino	25,588	12.4%
Black or African American	19,050	9.2%
Asian	15,595	7.5%
Other race	7,292	3.5%
American Indian / Alaska Native	872	0.4%
Native Hawaiian / Pacific Islander	328	0.2%

Household income

Under $10k 2.8%

$10k–$15k 1.3%

$15k–$25k 2.8%

$25k–$35k 3.9%

$35k–$50k 8.0%

$50k–$75k 15.7%

$75k–$100k 12.0%

$100k–$150k 23.0%

$150k–$200k 14.5%

$200k+ 16.1%

Range	% of households
Under $10k	2.8%
$10k–$15k	1.3%
$15k–$25k	2.8%
$25k–$35k	3.9%
$35k–$50k	8.0%
$50k–$75k	15.7%
$75k–$100k	12.0%
$100k–$150k	23.0%
$150k–$200k	14.5%
$200k+	16.1%
Median income	$106,540

Housing

Home values

Under $50k 2.1%

$50k–$100k 0.5%

$100k–$150k 2.4%

$150k–$200k 3.6%

$200k–$300k 26.8%

$300k–$500k 42.1%

$500k–$1M 21.6%

$1M+ 1.1%

Housing overview

Metric	Value
Median home value	$360,667
Median rent / month	$1,698
Owner occupied	64.8%
Renter occupied	35.2%
Vacant	4.3%
Single-family detached	73.7%
Large apartment buildings	11.0%
Mobile homes	0.3%
Median rooms	6.0
Avg household size (owned)	2.89

Year built

Era	%
2020 or later	1.9%
2010–2019	24.8%
2000–2009	29.8%
1990–1999	19.3%
1980–1989	14.0%
1970–1979	7.7%
1960–1969	1.1%
1950–1959	0.7%
1940–1949	0.4%
1939 or earlier	0.3%

Bedrooms

Size	% of units
No bedroom (studio)	1.5%
1 bedroom	9.9%
2 bedrooms	13.7%
3 bedrooms	38.1%
4 bedrooms	30.4%
5+ bedrooms	6.3%

Vehicles per household

Vehicles	% of households
No vehicle	2.5%
1 vehicle	28.1%
2 vehicles	47.2%
3 or more	22.3%

Heating fuel

Fuel type	%
Utility gas	56.9%
Electricity	41.9%
Propane / LP gas	0.6%
Fuel oil	0.1%
Solar	0.1%
No fuel used	0.4%

Households & families

Household type	Count	%
Married-couple family	37,596	58.1%
Cohabiting couple	3,885	5.9%
Male householder, no spouse	9,148	14.0%
Female householder, no spouse	14,502	22.0%
Households with children under 18	27,470	42.3%
Households with seniors (65+)	12,654	19.5%
Average household size	2.78

Marital status

Status	Male	Female
Never married	31.9%	26.3%
Married	57.1%	54.3%
Separated	1.5%	2.1%
Widowed	1.7%	4.8%
Divorced	7.7%	12.5%

Education

Less than 9th grade 3.1%

Some HS, no diploma 2.9%

HS graduate 16.7%

Some college, no degree 21.3%

Associate's degree 9.9%

Bachelor's degree 29.9%

Graduate / professional 16.3%

Metric	%
HS diploma or higher	94.0%
Bachelor's or higher	46.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	3,431	6.8%
Kindergarten	3,100	6.1%
Elementary school	21,178	41.8%
High school	11,525	22.8%
College / grad school	11,353	22.5%

Employment

Industry of employment

Education & healthcare 19.7%

Professional & management 17.5%

Retail trade 11.5%

Manufacturing 10.4%

Arts, food & hospitality 8.6%

Finance & real estate 7.1%

Public administration 6.0%

Construction 5.3%

Transportation & utilities 4.7%

Other services 4.6%

Information 2.3%

Wholesale trade 2.1%

Agriculture & mining 0.2%

Occupation

Category	%
Management, business & arts	50.3%
Service	12.8%
Sales & office	22.9%
Natural resources & construction	5.2%
Production & transportation	8.8%

Employment type

Type	%
Private sector	80.0%
Government	14.7%
Self-employed	5.3%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	67.5%
Carpool	9.5%
Public transit	0.1%
Walk	0.8%
Other means	1.1%
Avg commute (minutes)	25.9

Poverty

All people 6.6%

Under 18 years 8.6%

18 and over 6.0%

Married-couple families 2.3%

Female-led households 12.9%

Income support

Source	% of households
Social Security	19.7%
Retirement income	18.7%
Supplemental Security	2.8%
Cash public assistance	1.3%
Food stamps / SNAP	4.9%

Health indicators

Condition	%
High blood pressure	25.8%
High cholesterol	29.9%
Heart disease	3.6%
Stroke	1.8%
Asthma	8.5%
Arthritis	17.3%
Kidney disease	1.9%
Pulmonary disease	3.8%
Cancer	4.2%

Behavior / access	%
Binge drinking	21.6%
No physical activity	18.4%
Less than 7 hrs sleep	32.3%
Fair or poor health	11.1%
Poor mental health	14.2%
Poor physical health	7.9%
No health insurance	22.0%
Visited doctor (checkup)	68.1%
Visited dentist	63.1%
Cholesterol screening	89.1%
Teeth loss	9.5%

Veterans & disability

Veterans	Count	%
Civilian veterans	10,698	8.0%

Disability	%
Any disability	9.7%
Under 18	5.3%
18–64 years	8.5%
65 and over	29.2%

Health insurance coverage

Type	%
Private insurance	80.3%
Public insurance	18.7%
Uninsured under 19	6.7%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	170,309	93.8%
Spanish	13,298	7.8%
Other Indo-European	8,452	4.9%
Asian & Pacific Islander	1,548	0.9%
Other languages	2,531	1.5%

Place of birth & citizenship

Origin	Count	%
Native born (US)	153,456	84.5%
Born in same state	149,924	82.6%
Born in different state	87,799	48.4%
Foreign born	3,532	1.9%
Naturalized citizen	28,112	15.5%
Not a US citizen	14,678	52.2%

Ancestry

Ancestry	Count	%
French	19,022	10.5%
Italian	13,741	7.6%
Arab	8,066	4.4%
English	1,583	0.9%
Polish	1,439	0.8%

Ancestry	Count	%
Dutch	999	0.6%
German	712	0.4%
Irish	319	0.2%
Norwegian	254	0.1%

Technology access

Metric	% of households
Computer access	35.8%
Internet access	98.7%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What ZIP codes does Round Rock, TX have?

Round Rock, TX has 5 ZIP codes: 78664, 78665, 78681, 78681, 78682. Each ZIP code serves a distinct delivery area within the city and surrounding region.

What is the main ZIP code for Round Rock, TX?

The primary ZIP code for Round Rock, TX is 78664. The city uses area code 512 or 737 for phone service.

What county is Round Rock, TX in?

Round Rock is located in Williamson County, Texas.

How many ZIP codes are in Round Rock, TX?

Round Rock, TX has 5 ZIP codes.

What ZIP code covers the downtown Round Rock area near Old Main Street and the historic town center?

Downtown Round Rock and the historic Old Main Street area are primarily located in ZIP code 78664, which serves as the heart of the city's original downtown district.

Which ZIP codes service the Dell headquarters and the technology corridor in Round Rock?

Dell's Round Rock campus and the surrounding technology corridor are located in ZIP codes 78682 and 78681, which cover the northern and central business districts of the city.