ZIP Code 78681: Round Rock, TX
County: Williamson County
Coordinates: 30.50840, -97.70620
ZIP Type: Standard
Time Zone: Central Time (CT)
This profile provides an in-depth look at ZIP code 78681, serving Round Rock in TX. It lies in Williamson County and supports delivery, planning, and address verification.
| Primary City | Round Rock |
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| ZIP Code | 78681 |
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| County | Williamson County |
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| State | TX |
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| Latitude / Longitude | 30.50840, -97.70620 |
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| ZIP Type | Standard |
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| Time Zone | Central Time (CT) |
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| Data Updated | 2026-01-08 |
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Maps & Useful Links
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These links show the approximate center point for ZIP 78681 (not an exact boundary).
Geographic & Administrative Context
The geographic center of ZIP code 78681 is approximately 30.50840 (latitude) and -97.70620 (longitude). This location sits within Williamson County, contributing to regional planning across TX.
Local Coverage Notes
ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 78681 for mail delivery and general location reference in
Williamson County,
TX.
This ZIP may extend beyond the city core into nearby communities within Williamson County.
Related ZIP Codes (Nearby)
Explore other postal codes near Round Rock within TX.
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Frequently Asked Questions
What is the primary city for ZIP code 78681?
The primary city for this ZIP code is Round Rock, located in TX.
In which county is 78681 located?
ZIP code 78681 is situated within Williamson County, TX.
What are the coordinates for 78681?
The approximate center point is 30.50840 (Latitude) and -97.70620 (Longitude).
Is ZIP code 78681 active?
This page lists ZIP 78681 as Listed based on the latest refresh date shown above.
Does ZIP 78681 cover multiple areas?
Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.
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Methodology & Data Notes
How we build this page: We generate this page from a structured ZIP dataset and refresh key fields (city, county, and coordinates) during scheduled updates. Coordinates represent an approximate center point, not an official boundary map.
Sources: Public ZIP reference datasets and geographic coordinate references. If you use specific sources (e.g., USPS, Census), list them on your About/Methodology page.
Page updated: 2026-01-08