ZIP Code 78717

78717 is one of Texas's ZIP codes, delivering to addresses in Austin, Williamson County.

City: Austin
County: Williamson County
State: Texas
Prefix: 787xx

Where this code sits

78717 is part of the 787xx range, the group of codes handled by one mail processing centre. Austin is served by 74 ZIP codes in total; the full list, with the county each falls in, is on the Austin page.

Austin Texas ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78717 delivers to without sharing its boundary.

ZIP codes nearest 78717

The ZIP codes whose reference points sit closest to 78717.
ZIP code	Distance	Delivers to
ZIP code 78729	3.9 mi	Austin, TX
ZIP code 78681	4.1 mi	Round Rock, TX
ZIP code 78613	4.4 mi	Cedar Park, TX
ZIP code 78630	4.4 mi	Cedar Park, TX
ZIP code 78664	4.8 mi	Round Rock, TX
ZIP code 78665	4.8 mi	Round Rock, TX
ZIP code 78727	5.8 mi	Austin, TX
ZIP code 78728	5.9 mi	Austin, TX

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 78717, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 78717. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.