Round Rock, TX ZIP Codes
3 ZIP codes serve Round Rock, Texas: 78665, 78664 and 78681. Together they are home to 184,922 residents in 67,781 households. That is more than the 127,786 people counted inside Round Rock city limits, because these ZIP codes reach past its boundary. Median household income ranges from $87,417 in 78664 to $137,819 in 78681.
Round Rock city limits (Census)
| Measure | Census figure |
|---|---|
| Residents | 127,786 |
| Households | 48,647 |
| Median household income | $99,287 |
| Median home value | $418,600 |
| Median age | 36.2 |
| Median rent | $1,763 |
All 3 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 184,922 |
| Households (sum of ZIP codes) | 67,781 |
| Median household income, range across ZIP codes | $87,417 (78664) to $137,819 (78681) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $114,960 |
| Homeowners | 62.4% |
| Households with kids under 18 | 38.7% |
| Moved in the past year | 17.5% |
| Carrier routes in EDDM2GO's route library | 90 routes, 76,130 homes (3 of 3 ZIP codes) |
Top facts
- Highest median household income in Round Rock: 78681 ($137,819)
- Most residents: 78665 (66,171 people)
- Highest homeownership: 78681 (73.9% own their home)
- Most households with kids: 78681 (43.0% of households)
- Most new movers: 78665 (22.8% moved in last year)
- Youngest median age: 78664 (35.1 years)
- Highest median home value: 78681 ($497,300)
Every ZIP code in Round Rock
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 78665 | Round Rock | 66,171 | 24,162 | $122,680 | $474,100 | 61.4% | 42.1% | 22.8% | 33 | 31,509 | 61% of its land; mailing city |
| 78664 | Round Rock | 62,060 | 23,484 | $87,417 | $358,200 | 53.7% | 31.6% | 17.2% | 30 | 25,949 | 72% of its land; mailing city |
| 78681 | Round Rock | 56,691 | 20,135 | $137,819 | $497,300 | 73.9% | 43.0% | 11.6% | 27 | 22,690 | 45% of its land; mailing city |
A ZIP code is listed for Round Rock when at least 10% of its land lies inside Round Rock city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Round Rock. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Round Rock.
Counties
- Williamson County — 24 ZIP codes
- Travis County — 56 ZIP codes
Nearby cities sharing these ZIP codes
- Brushy Creek — 2 ZIP codes
Metro maps
- Austin ZIP code map — 89 ZIP codes
Price a mailing to Round Rock ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Round Rock, TX?
- 78665, 78664 and 78681. A ZIP code is listed for Round Rock when at least 10% of its land lies inside Round Rock city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Round Rock.
- What is the population of Round Rock, TX?
- The Census Bureau counts 127,786 residents inside Round Rock city limits (ACS 2020–2024). The 3 ZIP codes that serve Round Rock hold 184,922 residents in all.
- What is the median household income in Round Rock, TX?
- $99,287 inside Round Rock city limits, per the Census Bureau. Across its ZIP codes the medians run from $87,417 to $137,819.
- Which Round Rock ZIP code has the highest median household income?
- 78681, at $137,819, among ZIP codes with at least 1,000 residents.
- How many carrier routes and mailboxes are in Round Rock, TX?
- For the 3 of 3 ZIP codes in EDDM2GO's stored route library: 90 carrier routes reaching 76,130 residential and 4,015 business mailboxes.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.