Round Rock, Texas

Round Rock, Texas, in Williamson County, has ZIP codes 78664, 78665, 78680, 78681, 78682 and 78683 and area code 512, with 737 as an overlay.

ZIP codes: 78664, 78665, 78680, 78681 …
Area codes: 512, 737
County: Williamson County
State: Texas
Time zone: Central Time
Coordinates: 30.5846, -97.6371

ZIP codes in Round Rock

ZIP code	Post office	County	Area codes
78664	Round Rock	Williamson County	512, 737
78665	Round Rock	Williamson County	512, 737
78680^*	Round Rock	Williamson County	512, 737
78681	Round Rock	Williamson County	512, 737
78682^*	Round Rock	Williamson County	512, 737
78683^*	Round Rock	Williamson County	512, 737

* No mapped delivery area: P.O. boxes or a single organization. Area codes are those of the nearest ZIP code area.

Area codes for Round Rock

Area code 512
In service since 1947. Shares its area with 737. Local calls are dialed with ten digits.
Area code 737
In service since July 1, 2013. Shares its area with 512. Local calls are dialed with ten digits.

Area codes here are matched from telephone rate centers, so a place near a boundary can have local numbers from either side of it.

Time zone

Round Rock is in the Central Time zone.

Towns near Round Rock

Hutto9.4 km (5.8 mi)
Georgetown10.8 km (6.7 mi)
Weir10.9 km (6.8 mi)
Brushy Creek12.6 km (7.8 mi)
Serenada15.2 km (9.4 mi)
Pflugerville16 km (9.9 mi)
Wells Branch16.2 km (10 mi)
Walburg18 km (11 mi)

Local numbers in area code 512

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