ZIP Code 78665
- Zip Code: 78665
- Type: Standard
- Official USPS city name: Round Rock
- Official USPS State Code: TX
- Official State Name: Texas
- ZCTA: TRUE
- Population: 49074.0
- Density: 1010.1
- Primary Official County Code: 48491
- Primary Official County Name: Williamson
- Official County Name: Williamson
- Official County Code: 48491
- Imprecise: FALSE
- Military: FALSE
- Timezone: America/Chicago (19:36 PM Thursday, October 31 2024-10-31 (GMT -0500))
- Geo Point: 30.54488, -97.64378
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