ZIP Code 78634

78634 is one of Texas's ZIP codes, delivering to addresses in Hutto, Williamson County.

City: Hutto
County: Williamson County
State: Texas
Prefix: 786xx

Where this code sits

78634 is part of the 786xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Hutto.

Hutto Texas ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78634 delivers to without sharing its boundary.

ZIP codes nearest 78634

The ZIP codes whose reference points sit closest to 78634.
ZIP code	Distance	Delivers to
ZIP code 78664	6.0 mi	Round Rock, TX
ZIP code 78665	6.0 mi	Round Rock, TX
ZIP code 78691	6.7 mi	Pflugerville, TX
ZIP code 78681	6.8 mi	Round Rock, TX
ZIP code 78660	6.9 mi	Pflugerville, TX
ZIP code 78764	7.8 mi	Austin, TX
ZIP code 78728	8.9 mi	Austin, TX
ZIP code 78680	9.3 mi	Round Rock, 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 78634, plotted from its record coordinates.

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

Scope ZIP code 78634. 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.