City
ZIP codes in Round Rock, Texas
Round Rock is a city in Williamson County, Texas, with a population of 119,468, about 0.4% of the state's residents, at roughly 3,094 people per square mile. It has 6 ZIP codes, uses area codes 512 and 737 and follows Central Time.
Round Rock at a glance · Data updated
- 119,468
- Residents
- 6
- ZIP codes
- 48,647
- Households
- $99,287
- Median household income
- 36.2
- Median age
- 39
- Square miles
Each shape is a residential ZIP code area (circles mark areas without an outline). Select one for details.
Round Rock compared with Texas
All 6 ZIP codes in Round Rock
Select a ZIP code to see its map and demographics.
No ZIP codes match.
| Standard | 60,287 | $87,417 | 35.1 | |
| Standard | 61,577 | $122,680 | 35.5 | |
| PO Box | — | — | — | |
| Standard | 57,503 | $137,819 | 39.3 | |
| Unique | — | — | — | |
| PO Box | — | — | — |
How Round Rock ranks
What stands out about Round Rock: household incomes well above the state median.
- Population: 119,468 — 31st of 53 cities in Texas.
- Median household income: $99,287 — 13th of 53 cities in Texas.
- Median age: 36.2 — 14th of 53 cities in Texas.
- Share of adults with a bachelor's degree: 44.8% — 15th of 53 cities in Texas.
- Population density: 3,094/sq mi — 13th of 53 cities in Texas.
Inside Round Rock's ZIP codes
Of the 6 ZIP codes tied to Round Rock, 3 (50%) are standard delivery areas that cover real neighborhoods; the rest are 2 PO Box and 1 unique-organization codes that serve mailboxes or single large recipients rather than residents.
Residents are spread across 3 populated ZIP codes. The largest, 78665, holds 61,577 people (34% of the city's ZIP-level population), and the three largest together hold 100%. That is a fairly concentrated layout.
Compared with similar Texas cities
| City | Population | Median income | Median age | ZIP codes |
|---|---|---|---|---|
| College Station → | 120,511 | $50,900 | 22.9 | 6 |
| Richardson → | 119,469 | $98,111 | 33.9 | 5 |
| Round Rock | 119,468 | $99,287 | 36.2 | 6 |
| Beaumont → | 115,282 | $56,997 | 35.3 | 13 |
| The Woodlands → | 114,436 | $140,701 | 40.6 | 3 |
| Odessa → | 114,428 | $73,472 | 31.1 | 9 |
| League City → | 114,392 | $121,099 | 37.7 | 2 |
Frequently asked questions about ZIP codes in Round Rock
How many ZIP codes does Round Rock have?+
Round Rock has 6 ZIP codes: 3 standard, 2 PO Box and 1 unique-organization. Only standard ZIP codes cover residential areas; 3 of them have residents according to the Census.
Which ZIP code in Round Rock has the most people?+
78665 is the most populated, with 61,577 residents and a median household income of $122,680.
What is the median household income in Round Rock?+
$99,287, which is 25% above the Texas median.
How big is Round Rock compared with other Texas cities?+
Round Rock is the 31st largest of the 53 Texas cities we cover, with 119,468 residents.
What time zone and area codes does Round Rock use?+
Round Rock is in the Central Time zone and uses area codes 512 and 737.