The 621 area code covers the same area as 346, including Houston, Bammel and 33 more places in Texas.
Area code 621 is in Texas, on Central Time. In the 621 area, phone numbers are given out most in Harris County, then Fort Bend and Galveston counties. It has been in service since January 23, 2025. 281, 346, 713 and 832 cover the same area, so two neighbours can have different area codes.
- Where
- 8 counties in Texas, mostly Harris County, Fort Bend County and Galveston County
- Time zone
- Central Time
- In service since
- January 23, 2025
- Shares its area with
- 281 (since 1996), 346 (since 2014), 713 (since 1947) and 832 (since 1999)
- Prefixes in use
- None assigned yet, per NANPA
- How to dial
- Local calls need all 10 digits: 621-555-0142.
Find out who called you from a 621 number.
Enter the full 10-digit number to see who it is listed to, the city and state on the listing, and whether it is a mobile, landline or VoIP line. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup.
621 started in 2025 as an overlay on 346, and its ground has not changed since.
2025
621 starts on January 23, 2025, as an overlay on 346: new numbers on the same ground.
A 621 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 621 are 979, 409 and 936.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
Texas has 28 other area codes.
These are the questions people ask most about area code 621.
Where is area code 621?
621 covers Houston, Bammel, Langham Creek and Spring and 31 more places in Texas. In the 621 area, phone numbers are given out most in Harris County, then Fort Bend and Galveston counties.
What state is area code 621 in?
Texas. 621 is a Texas area code on Central Time.
What cities use area code 621?
The places holding the most 621 prefixes are Houston, Bammel, Langham Creek, Spring, Cypress, Sugar Land, Baytown and Satsuma, out of 35 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
What time zone is area code 621 in?
621 is on Central Time.
When did area code 621 start?
621 went into service on January 23, 2025, as an overlay on 346: new numbers for the same area.
Is 621 the same area as 281, 346, 713 and 832?
Yes. 281 (since 1996), 346 (since 2014), 713 (since 1947) and 832 (since 1999) cover the same ground as 621. Nobody's number changed when they were added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 621 number?
Local calls need all 10 digits: 621-555-0142.
Is 621 a toll-free number?
No. 621 is a regular area code for Houston and Bammel in Texas, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 621?
The closest are 979 (Bryan, Texas), 409 (Beaumont, Texas), 936 (Conroe, Texas) and 512/737 (Austin, Texas), measured between the centres of each area.
Who called me from a 621 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 621 a scam?
621 is a real Texas area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.