Area Code 621 Location & Details
State / Region: Texas • Country: United States
Major Cities Covered: Houston, Pasadena, Pearland, League City, Sugar Land, Baytown, Missouri City, Fulshear, Rosenberg, Friendswood
Area Code 621 Geographic Map
Interactive location bounds and coverage area for Texas (Central / Mountain Timezone)
Where is Area Code 621 Located?
Telephone area code 621 is assigned to Texas in United States. It serves cities and metropolitan communities including Houston, Pasadena, Pearland, League City, Sugar Land, Baytown, Missouri City, Fulshear, Rosenberg, Friendswood.
For local and long-distance calls within area code 621, standard 10-digit dialing (621) XXX-XXXX applies.
Who Called Me from Area Code 621?
Received an unknown call, missed call, or text scam from area code 621? Here is how to trace who is calling from 621 area code and verify unknown numbers safely:
Legitimate contacts usually leave a detailed voicemail or caller ID record.
Robocallers often fake incoming caller ID numbers using your local 621 prefix to boost pick-up rates.
Search public white-pages or use caller intelligence guides before returning unfamiliar calls.
How to Call Area Code 621 & Dialing Format
When placing a phone call to a number in area code 621, follow the correct dialing format depending on your calling location:
- Calling from inside the US / Canada (+1): Dial
1 + (621) + 7-digit number. - Calling from an international location outside +1: Dial your country's international exit code (e.g.
011in US or+on mobile) +1+621+7-digit number. - Do I need to dial area code 621 for local calls? Yes, 10-digit dialing (area code + line number) is mandatory across North American telephone networks.
Top Cities & Municipalities Served in Area Code 621
Urban centers, census places, and communities within the +1-621 calling area
| City Name | County | Population | % of 621 Pop |
|---|---|---|---|
| Houston | Harris County | 2,397,315 | 65.6% |
| Pasadena | Harris County | 148,539 | 4.1% |
| Pearland | Harris County | 129,930 | 3.6% |
| League City | Galveston County | 119,905 | 3.3% |
| Sugar Land | Fort Bend County | 107,726 | 2.9% |
| Baytown | Chambers County | 86,561 | 2.4% |
| Missouri City | Fort Bend County | 77,327 | 2.1% |
| Fulshear | Fort Bend County | 64,630 | 1.8% |
| Rosenberg | Fort Bend County | 42,701 | 1.2% |
| Friendswood | Harris County | 41,319 | 1.1% |
| La Porte | Chambers County | 37,983 | 1.0% |
| Deer Park | Harris County | 34,282 | 0.9% |
| Alvin | Brazoria County | 30,115 | 0.8% |
| Katy | Waller County | 28,373 | 0.8% |
| Dickinson | Galveston County | 21,908 | 0.6% |
| Manvel | Brazoria County | 20,699 | 0.6% |
| Iowa Colony | Brazoria County | 20,503 | 0.6% |
| Stafford | Fort Bend County | 18,043 | 0.5% |
| Humble | Harris County | 16,484 | 0.5% |
| South Houston | Harris County | 16,407 | 0.4% |
Counties Covered by Area Code 621
Geographic county distribution and population coverage across Texas
| County Name | Total Population | % of 621 Area | % of County |
|---|---|---|---|
| Harris County | 4,996,331 | 77.2% | 56% |
| Fort Bend County | 951,028 | 9.2% | 35% |
| Galveston County | 367,367 | 5.0% | 50% |
| Chambers County | 55,988 | 4.2% | 100% |
| Brazoria County | 411,416 | 2.0% | 17% |
| Waller County | 66,097 | 0.9% | 52% |
| Montgomery County | 751,183 | 0.9% | 4% |
| San Jacinto County | 29,328 | 0.3% | 34% |
| Liberty County | 116,291 | 0.2% | 7% |
| Hill County | 38,889 | 0.1% | 7% |
☎️Area Code 621 Exchange Prefixes & Carriers
Showing 14 of 14 central office 3-digit prefixes and assigned telecom carriers
| Prefix | Line Usage | Rate Center | Assigned Carrier | Assign Date |
|---|---|---|---|---|
| (621) 211- | 📞Landline | XXXXXXXXXX | MULTIPLE OCN LISTING | N/A |
| (621) 311- | 📞Landline | XXXXXXXXXX | MULTIPLE OCN LISTING | N/A |
| (621) 411- | 📞Landline | XXXXXXXXXX | MULTIPLE OCN LISTING | N/A |
| (621) 511- | 📞Landline | XXXXXXXXXX | MULTIPLE OCN LISTING | N/A |
| (621) 555- | 📞Landline | DIR ASST | MULTIPLE OCN LISTING | N/A |
| (621) 611- | 📞Landline | XXXXXXXXXX | MULTIPLE OCN LISTING | N/A |
| (621) 700- | 📞Landline | XXXXXXXXXX | MULTIPLE OCN LISTING | N/A |
| (621) 711- | 📞Landline | XXXXXXXXXX | MULTIPLE OCN LISTING | N/A |
| (621) 811- | 📞Landline | XXXXXXXXXX | MULTIPLE OCN LISTING | N/A |
| (621) 911- | 📞Landline | XXXXXXXXXX | MULTIPLE OCN LISTING | N/A |
| (621) 950- | 📞Landline | XXXXXXXXXX | MULTIPLE OCN LISTING | N/A |
| (621) 958- | 📞Landline | XXXXXXXXXX | MULTIPLE OCN LISTING | N/A |
| (621) 959- | 📞Landline | XXXXXXXXXX | MULTIPLE OCN LISTING | N/A |
| (621) 976- | 📞Landline | XXXXXXXXXX | MULTIPLE OCN LISTING | N/A |
Frequently Asked Questions about Area Code 621
Where is area code 621 located?
Area code 621 is located in Texas (United States), serving cities like Houston, Pasadena, Pearland, League City, Sugar Land, Baytown, Missouri City, Fulshear, Rosenberg, Friendswood.
What timezone is area code 621?
Area code 621 operates in the Central / Mountain timezone.
What state is area code 621?
Area code 621 is assigned to the state / telecom territory of Texas.
Is area code 621 a scam or dangerous?
Area code 621 is an official geographic area code for Texas. However, beware of robocaller spoofing.
Texas State Area Codes
View complete directory of telephone area codes assigned to Texas.
Explore Texas DirectoryGet a 621 Business Phone Number
How to acquire a virtual phone number or business line with area code 621 for local customer trust in Texas.
Get 621 Business NumberCheck high-risk international callback scam area codes and robocall warning databases.
Scam Area Codes 2026Overlay & Nearby Area Codes for Texas
Explore neighboring telecom prefixes sharing geographical boundaries with area code 621.