Round Rock, TX Area Codes
Round Rock, Texas (population 141,282) uses area codes 737 and 512.
Round Rock has no telephone exchange of its own in NANPA records; it is served by the Hutto exchange about 11.7 km away.
Carriers with Round Rock numbers
7 prefixes are assigned to the Hutto exchange: 14% mobile, 43% VoIP and cable, 43% landline.
| Carrier | Prefixes |
|---|---|
| Onvoy (Sinch) | 2 |
| Brightspeed Of Texas | 2 |
| Lumen (Level 3) | 1 |
| AT&T Mobility | 1 |
| Grande Communications Networks | 1 |
Area codes used in Round Rock
| Area code | Prefixes serving Round Rock | Main carriers in this code |
|---|---|---|
| 737 | 4 | Onvoy (Sinch), T-Mobile, AT&T Mobility |
| 512 | 3 | AT&T (Southwestern Bell), AT&T Mobility, T-Mobile |
Round Rock phone number prefixes
Numbers starting with these first six digits were originally assigned to the Hutto exchange.
737-259Lumen (Level 3)737-306AT&T Mobility737-327Onvoy (Sinch)737-391Onvoy (Sinch)512-642Grande Communications Networks512-759Brightspeed Of Texas512-846Brightspeed Of Texas
Nearby cities in area code 737
- Austin
- Georgetown
- Leander
- Cedar Park
- San Marcos
- Kyle
- Pflugerville
- Hutto
- Manor
- Brushy Creek
- Lakeway
- Steiner Ranch
Questions
- What is the area code for Round Rock, TX?
- Round Rock uses 2 area codes: 737 and 512. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.
- What time zone is Round Rock in?
- Round Rock is in the Central time zone.