🇺🇸 621 area code
Area code 621 covers Houston, Katy, Humble and Spring and the surrounding area in Texas. It shares that territory with 281, 346, 713 and 832, so the same neighbourhood can have numbers in any of them. Enter a 621 number below for a free check before you call back.
- Location: Houston, Texas
- Time zone: Central (UTC−6)
- In service since January 23, 2025
查询号码
首次查询即可得到有效性、运营商、线路类型和地区。
Area code 621 at a glance
Cities in the 621 overlay area
- Houston
- Katy
- Humble
- Spring
- Pearland
- Texas
- Pasadena
- Sugar Land
- League City
- Louisiana Street
Is a 621 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so a 621 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing a 621 number to people in Texas because a local-looking call is more likely to be answered. If a 621 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 621
621 entered service on January 23, 2025, as an overlay on 346, which had run short of numbers.
It is part of the 281/346/621/713/832 overlay: the codes cover the same area, and a new line there can be given a number in any of them. Two neighbours — or two phones in one household — can have different area codes. That is also why local calls need the full ten digits.
Because 621 overlays the same ground, the cities listed are those of the codes it shares with.
常见问题
Area code 621 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 621?
Area code 621 is in Texas, United States. It covers Houston, Katy, Humble, Spring, Pearland and Texas.
What time zone is area code 621?
621 is in the Central (UTC−6) time zone, and observes daylight saving time.
What area codes overlay 621?
281, 346, 713 and 832 serve the same area as 621. Numbers in all of them are local to one another.
When did area code 621 start?
621 entered service on January 23, 2025, created from 346.
How do I find out who called me from 621?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 621?
If you live in or near Texas, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 621 callers who will not leave a message are best looked up before you call back.