Find the last 4 digits (ZIP+4) for an address in 78681

ZIP 78681, Round Rock, TX is filled in. Just type the street address.

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ZIP Code 78681 – Round Rock, TX

Round Rock, Texas · Williamson County · Central time

ZIP code78681
CityRound Rock
StateTexas
CountyWilliamson County
Population56,691
Time zoneCentral · local time
ZIP typeStandard (has a Census ZCTA area)
Land area23.19 sq mi
Center (lat, long)30.5418, -97.7166

Area codes in this area

512737

These are the area codes that most often serve ZIP 78681 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

78717 Austin · 4.2 mi78665 Round Rock · 4.8 mi78664 Round Rock · 4.8 mi78729 Austin · 6.3 mi78728 Austin · 6.3 mi78613 Cedar Park · 6.6 mi78630 Cedar Park · 6.7 mi78627 Georgetown · 6.7 mi

About ZIP 78681

ZIP code 78681 is assigned to Round Rock, Texas. It lies in Williamson County. Its Census area covers about 23.19 square miles of land. The closest neighboring ZIP is 78717 (Austin), about 4.2 miles away.

Every address in 78681 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources