ZIP code 78664: Round Rock, TX
78664 is a ZIP code in Round Rock, Texas, mainly in Williamson County, part of the Austin-Round Rock-San Marcos, TX metro area. About 62,060 people live here.
- Population
- 62,060
- Median household income
- $87,417
- Typical home value
- $327,600-5.6% in 12 months
- Median rent
- $1,692gross, per month
- Median age
- 35.1
- Homeowners
- 53.7%of occupied homes
Shaded: ZIP code 78664's area. Click anywhere on the map to see which ZIP code it's in.
ZIP codes within 10 milesWithin 25 miles
ZIP code 78664 details
| City | Round Rock |
|---|---|
| State | Texas |
| County | Williamson County (also partly Travis County) |
| Metro area | Austin-Round Rock-San Marcos, TX |
| Time zone | Central Time (UTC−6), observes daylight saving time |
| Type | Standard (delivery area) |
| Land area | 16.6 sq mi, plus 0.1 sq mi of water |
| Population density | 3,736 people per sq mi |
| Bachelor's degree or higher | 36.4% of adults 25+ |
| Average commute | 25.6 minutes |
| Center coordinates | 30.50541, -97.64728 |
Median rent in 78664 by bedrooms
| Size | Median gross rent |
|---|---|
| Studio | $1,659/mo |
| 1 bedroom | $1,332/mo |
| 2 bedrooms | $1,708/mo |
| 3 bedrooms | $2,017/mo |
| 4 bedrooms | $2,275/mo |
Gross rent includes utilities paid by the tenant. ACS 2020–2024; sizes with too few rentals to estimate are left out.
ZIP codes near 78664
| ZIP code | City | Distance | Population |
|---|---|---|---|
| 78665 | Round Rock, TX | 3.1 mi | 66,171 |
| 78764 | Austin, TX | 4.2 mi | — |
| 78728 | Austin, TX | 4.3 mi | 26,777 |
| 78681 | Round Rock, TX | 4.8 mi | 56,691 |
| 78691 | Pflugerville, TX | 4.8 mi | — |
| 78660 | Pflugerville, TX | 5.5 mi | 124,834 |
| 78717 | Austin, TX | 6.4 mi | 37,262 |
| 78727 | Austin, TX | 6.7 mi | 29,958 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Buying a home in 78664?
A typical home in ZIP code 78664 is worth about $327,600 (Zillow Home Value Index). The median household here earns $87,417 a year. See what buying here would cost per month, with Texas average taxes and insurance filled in.
Monthly payment for a $327,600 homeWhat can a $87,417 income afford?Rental property numbers
About ZIP code 78664
What city is ZIP code 78664?
ZIP code 78664 is in Round Rock, TX, in Williamson County.
What county is ZIP code 78664 in?
78664 is mainly in Williamson County, Texas, and partly in Travis County.
What is the population of ZIP code 78664?
About 62,060 people live in ZIP code 78664, according to the American Community Survey 2020–2024 5-year estimates.
What time zone is ZIP code 78664 in?
78664 is in Central Time (UTC−6). It observes daylight saving time.