ZIP code 78664
Where is ZIP code 78664?
Round Rock, Texas
Williamson County · Standard ZIP code
ZIP code 78664 belongs to Round Rock, Texas in Williamson County. 78664 is a standard ZIP code, so it covers street addresses as well as PO Boxes. It is in the Central Time zone and uses area codes 512 and 737. About 62,060 people live in the 78664 area, where the median household income is $87,417. The closest ZIP codes are 78665 (Round Rock, 0 mi north), 78681 (Round Rock, 0.8 mi southwest) and 78717 (Austin, 4.8 mi west).
| ZIP code | 78664 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Round Rock |
| State | Texas (TX) |
| County | Williamson County |
| Time zone | Central Time · now |
| Area codes | 512, 737 |
| Coordinates | 30.5145, -97.668 map |
| 3-digit prefix | 786 |
Population and income in 78664
| Population | 62,060 · higher than 96% of Texas ZIP codes |
|---|---|
| People per square mile | 3,736 · higher than 88% of Texas ZIP codes |
| Median age | 35.1 years · lower than 69% of Texas ZIP codes |
| Men / women | 48% / 52% |
| Median household income | $87,417 · higher than 74% of Texas ZIP codes |
| Income per person | $43,876 |
| Below the poverty line | 10% |
| Bachelor’s degree or higher | 36% of adults 25+ |
| Median home value | $358,200 · higher than 83% of Texas ZIP codes |
| Median rent | $1,692 a month |
| Housing units | 24,497 |
| Households | 23,484 (2.62 people on average) |
| Owners / renters | 54% / 46% |
| Land area | 16.61 sq mi (plus 0.09 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 78664. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 78664
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 78665 | Round Rock, TX | 0 mi N | Standard |
| 78681 | Round Rock, TX | 0.8 mi SW | Standard |
| 78717 | Austin, TX | 4.8 mi W | Standard |
| 78764 | Austin, TX | 4.8 mi S | PO Box only |
| 78651 | Mc Neil, TX | 5 mi SW | PO Box only |
| 78728 | Austin, TX | 5.1 mi S | Standard |
| 78660 | Pflugerville, TX | 5.5 mi SE | Standard |
| 78691 | Pflugerville, TX | 5.9 mi SE | PO Box only |
| 78634 | Hutto, TX | 6 mi E | Standard |
| 78727 | Austin, TX | 6.9 mi SW | Standard |
| 78729 | Austin, TX | 7.4 mi SW | Standard |
| 78627 | Georgetown, TX | 8.2 mi N | PO Box only |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 78664 or measure the distance to another ZIP code.
How to address mail to 78664
123 MAIN ST
ROUND ROCK TX 78664
Put the city, the two-letter state code and the ZIP code on the last line. Avoid Old Round Rock and Three Point: USPS doesn’t recognize them as the city for this ZIP code. Adding the 4-digit ZIP+4 code (78664-XXXX) helps mail sort faster but isn’t required.
Other ZIP codes in Round Rock, TX
All Round Rock ZIP codes with population and income →
Questions
- What city is ZIP code 78664?
- 78664 is a Round Rock, Texas ZIP code.
- What county is 78664 in?
- ZIP code 78664 is in Williamson County, Texas.
- What time zone is ZIP code 78664 in?
- 78664 is in the Central Time zone (America/Chicago).
- What area code is 78664?
- Phone numbers in ZIP code 78664 use area codes 512 and 737.
- What is the population of ZIP code 78664?
- About 62,060 people live in ZIP code 78664, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 78664?
- The median household income in 78664 is $87,417 a year, higher than 74% of Texas ZIP codes.
- What ZIP codes are near 78664?
- The nearest ZIP codes to 78664 are 78665 (Round Rock, 0 miles), 78681 (Round Rock, 0.8 miles), 78717 (Austin, 4.8 miles) and 78764 (Austin, 4.8 miles).