Area code 621: Texas
Area code 621 is a US state area code for Texas, on Central Time. It shares its area with 281, 346, 713 and 832, so local numbers there can start with any of them. Local calls there take 10 digits.
Local time in area code 621
America/Chicago
Prefixes in service
No public data
Too new for prefix data
Area code 621 facts
| Location | Texas, United States |
|---|---|
| Time zone | Central Time |
| Overlays | 281, 346, 713, 832 |
| Overlay of | 346 |
| In service since | January 23, 2025 |
| Local calls | 10 digits; toll calls 1 + 10 digits |
| Carrier | Not shown. An area code is where a number was issued; numbers port between carriers. Check line type |
How do I dial a 621 number?
NANPA's dialling plan for 621: local calls inside the code take 10 digits, toll calls 1 + 10 digits. From another area code, dial 1 first. From abroad, use +1. The examples use 555-0147, from a range reserved for fictional numbers.
| Local call inside 621 | 621-555-0147 |
|---|---|
| From another US or Canadian area code | 1-621-555-0147 |
| From outside North America | +1 621 555 0147 |
| E.164, for CRMs and SMS tools | +16215550147 |
When did area code 621 start?
Area code 621 went into service on January 23, 2025 as an overlay of 346. Today 621, 281, 346, 713 and 832 cover the same area as an overlay, which is why 10-digit dialling is needed for local calls there.
Tools for 621 numbers
- Area code lookup
Look up any code or a whole list of numbers, or find the codes for a state or city.
- Area code time zone
Local time for a list of numbers, with a callable-now flag.
- NPA-NXX lookup
Rate center and state for one prefix, a level below the area code.
- TCPA calling hours checker
Whether it's inside the federal 8 a.m. to 9 p.m. calling window there now.
Next step
A 621 number tells you where it was issued, not what it is now.
Mobiles, landlines and VoIP lines share area codes, and numbers move between carriers. A live line-type and carrier lookup on every number in your list says which is which, and that decides which calling and texting rules apply. It's in the Email + Phone plan.
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Area code 621 questions
- What state is area code 621?
- Area code 621 is in Texas, United States.
- What time zone is area code 621 in?
- Central Time.
- What area codes overlay 621?
- 281, 346, 713 and 832. An overlay adds a new code to the same area instead of splitting it, so neighbours can have different area codes and local calls need 10 digits.
- When did area code 621 start?
- Area code 621 went into service on January 23, 2025 as an overlay of 346.
- Is a 621 number a cell phone or a landline?
- The area code can't tell you. In the US and Canada mobiles, landlines and VoIP lines share area codes and prefixes, and numbers move between carriers and line types. Only a live line-type lookup answers it for one number.
Other area codes in Texas
210214254281325346361409430432469512682713726737806817830832903915936940945956972979
Sources
Location, overlays, in-service date and dialling plan: NANPA NPA database, file dated 10/16/2026. Prefixes and rate centers: NANPA central office code assignments, 10/17/2026. Time zones mapped to the IANA time zone database. By the SimpleVerifier Team; how we build these pages.