Find the last 4 digits (ZIP+4) for an address in 78731

ZIP 78731, Austin, TX is filled in. Just type the street address.

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ZIP Code 78731 – Austin, TX

Austin, Texas · Travis County · Central time

ZIP code78731
CityAustin
StateTexas
CountyTravis County
Population27,507
Time zoneCentral · local time
ZIP typeStandard (has a Census ZCTA area)
Land area8.75 sq mi
Center (lat, long)30.3482, -97.7681

Area codes in this area

512737

These are the area codes that most often serve ZIP 78731 (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

73301 Austin · 1.5 mi73344 Austin · 1.5 mi78651 Mc Neil · 1.5 mi78708 Austin · 1.5 mi78709 Austin · 1.5 mi78711 Austin · 1.5 mi78718 Austin · 1.5 mi78720 Austin · 1.5 mi

About ZIP 78731

ZIP code 78731 is assigned to Austin, Texas. It lies in Travis County. Its Census area covers about 8.75 square miles of land. The closest neighboring ZIP is 73301 (Austin), about 1.5 miles away.

Every address in 78731 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