621 Area CodeHouston, TX
Area code 621 covers Houston and 100 other cities in Texas: 6,400,711 people in 9 counties, led by Harris and Fort Bend, on Central Time (CT). It overlays 281, 346, 713, and 832.
Overview
- Major City
- Houston
- State
- Texas (TX)
- Timezone
- Central Time (CT)
- Current Time
- –:––
- Overlay
- Yes – shares area with 281, 346, 713, 832
Where is area code 621?
Overview of the 621 Area Code
Geographic Coverage of the 621 Area Code
All 101 cities- 2,390,125
- 149,617
- 129,620
- 118,456
- 109,851
- The Woodlandsalso 93693,847
Houston Area Codes Overview
What cities does area code 621 cover?
| City | State | Population | Population in 621 | % of listed-city population | % of City |
|---|---|---|---|---|---|
| Houston | TX | 2,390,125 | 2,390,125 | 56.9% | 100.0% |
| Pasadena | TX | 149,617 | 149,617 | 3.6% | 100.0% |
| Pearland | TX | 129,620 | 129,620 | 3.1% | 100.0% |
| League City | TX | 118,456 | 118,456 | 2.8% | 100.0% |
| Sugar Land | TX | 109,851 | 109,851 | 2.6% | 100.0% |
| The Woodlands | TX | 93,847 | 71,474 | 2.2% | 76.2% |
| Baytown | TX | 86,004 | 86,004 | 2.1% | 100.0% |
| Missouri City | TX | 78,582 | 78,582 | 1.9% | 100.0% |
| Atascocita | TX | 65,844 | 65,844 | 1.6% | 100.0% |
| Texas City | TX | 57,875 | 0 | 1.4% | 0.0% |
| Fulshear | TX | 54,629 | 54,629 | 1.3% | 100.0% |
| Spring | TX | 54,298 | 54,298 | 1.3% | 100.0% |
| Rosenberg | TX | 42,571 | 42,571 | 1.0% | 100.0% |
| Friendswood | TX | 41,291 | 41,291 | 1.0% | 100.0% |
| Channelview | TX | 38,289 | 38,289 | 0.9% | 100.0% |
| La Porte | TX | 38,046 | 38,046 | 0.9% | 100.0% |
| Mission Bend | TX | 36,501 | 36,501 | 0.9% | 100.0% |
| Deer Park | TX | 34,495 | 34,495 | 0.8% | 100.0% |
| Alvin | TX | 29,869 | 29,869 | 0.7% | 100.0% |
| Katy | TX | 27,741 | 27,741 | 0.7% | 100.0% |
| Cloverleaf | TX | 22,942 | 22,942 | 0.5% | 100.0% |
| Dickinson | TX | 21,941 | 21,941 | 0.5% | 100.0% |
| Manvel | TX | 19,309 | 19,309 | 0.5% | 100.0% |
| Fresno | TX | 19,069 | 19,069 | 0.5% | 100.0% |
| Cinco Ranch | TX | 18,274 | 18,274 | 0.4% | 100.0% |
| Stafford | TX | 17,555 | 17,555 | 0.4% | 100.0% |
| Bellaire | TX | 17,439 | 17,439 | 0.4% | 100.0% |
| Iowa Colony | TX | 17,240 | 17,240 | 0.4% | 100.0% |
| Humble | TX | 16,561 | 16,561 | 0.4% | 100.0% |
| South Houston | TX | 16,146 | 16,146 | 0.4% | 100.0% |
| Pecan Grove | TX | 15,963 | 15,963 | 0.4% | 100.0% |
| Aldine | TX | 15,869 | 15,869 | 0.4% | 100.0% |
| New Territory | TX | 15,186 | 15,186 | 0.4% | 100.0% |
| Tomball | TX | 15,152 | 15,152 | 0.4% | 100.0% |
| West University Place | TX | 15,149 | 15,149 | 0.4% | 100.0% |
| Seabrook | TX | 13,976 | 13,976 | 0.3% | 100.0% |
| Sienna Plantation | TX | 13,721 | 13,721 | 0.3% | 100.0% |
| Richmond | TX | 13,305 | 13,305 | 0.3% | 100.0% |
| Webster | TX | 12,548 | 12,548 | 0.3% | 100.0% |
| Four Corners | TX | 12,382 | 12,382 | 0.3% | 100.0% |
| Greatwood | TX | 11,538 | 11,538 | 0.3% | 100.0% |
| Galena Park | TX | 10,438 | 10,438 | 0.3% | 100.0% |
| Mont Belvieu | TX | 10,229 | 10,229 | 0.2% | 100.0% |
| Cleveland | TX | 9,757 | 9,757 | 0.2% | 100.0% |
| Jacinto City | TX | 9,431 | 9,431 | 0.2% | 100.0% |
| Bacliff | TX | 8,619 | 8,619 | 0.2% | 100.0% |
| Jersey Village | TX | 7,791 | 7,791 | 0.2% | 100.0% |
| Highlands | TX | 7,522 | 7,522 | 0.2% | 100.0% |
| Magnolia | TX | 6,506 | 6,506 | 0.2% | 100.0% |
| Brookshire | TX | 5,782 | 5,782 | 0.1% | 100.0% |
| Nassau Bay | TX | 5,229 | 5,229 | 0.1% | 100.0% |
| San Leon | TX | 4,970 | 4,970 | 0.1% | 100.0% |
| Meadows Place | TX | 4,630 | 4,630 | 0.1% | 100.0% |
| Weston Lakes | TX | 4,514 | 4,514 | 0.1% | 100.0% |
| Hunters Creek Village | TX | 4,482 | 4,482 | 0.1% | 100.0% |
| Spring Valley Village | TX | 4,394 | 4,394 | 0.1% | 100.0% |
| Bunker Hill Village | TX | 3,889 | 3,889 | 0.1% | 100.0% |
| Shenandoah | TX | 3,839 | 3,839 | 0.1% | 100.0% |
| Taylor Lake Village | TX | 3,792 | 3,792 | 0.1% | 100.0% |
| Beach City | TX | 3,456 | 3,456 | 0.1% | 100.0% |
| Barrett | TX | 3,199 | 3,199 | 0.1% | 100.0% |
| Piney Point Village | TX | 3,143 | 3,143 | 0.1% | 100.0% |
| Oak Ridge North | TX | 3,003 | 3,003 | 0.1% | 100.0% |
| El Lago | TX | 2,990 | 2,990 | 0.1% | 100.0% |
| Kemah | TX | 2,853 | 2,853 | 0.1% | 100.0% |
| Fifth Street | TX | 2,486 | 2,486 | 0.1% | 100.0% |
| Arcola | TX | 2,453 | 2,453 | 0.1% | 100.0% |
| Hedwig Village | TX | 2,386 | 2,386 | 0.1% | 100.0% |
| Roman Forest | TX | 2,367 | 2,367 | 0.1% | 100.0% |
| Crosby | TX | 2,299 | 2,299 | 0.1% | 100.0% |
| Pinehurst | TX | 2,226 | 2,226 | 0.1% | 100.0% |
| Splendora | TX | 2,063 | 2,063 | 0.1% | 100.0% |
| Anahuac | TX | 2,023 | 0 | 0.1% | 0.0% |
| Sheldon | TX | 1,990 | 1,990 | 0.0% | 100.0% |
| Patton Village | TX | 1,980 | 1,980 | 0.0% | 100.0% |
| Southside Place | TX | 1,908 | 1,908 | 0.0% | 100.0% |
| Porter Heights | TX | 1,653 | 1,653 | 0.0% | 100.0% |
| Plum Grove | TX | 1,639 | 1,639 | 0.0% | 100.0% |
| Brookside Village | TX | 1,613 | 1,613 | 0.0% | 100.0% |
| Woodbranch | TX | 1,587 | 1,587 | 0.0% | 100.0% |
| Shoreacres | TX | 1,540 | 1,540 | 0.0% | 100.0% |
| Old River-Winfree | TX | 1,383 | 1,383 | 0.0% | 100.0% |
| Clear Lake Shores | TX | 1,294 | 1,294 | 0.0% | 100.0% |
| Pleak | TX | 1,182 | 1,182 | 0.0% | 100.0% |
| Rosharon | TX | 1,152 | 1,152 | 0.0% | 100.0% |
| Fairchilds | TX | 1,039 | 0 | 0.0% | 0.0% |
| Cumings | TX | 981 | 981 | 0.0% | 100.0% |
| Hilshire Village | TX | 837 | 837 | 0.0% | 100.0% |
| Beasley | TX | 805 | 0 | 0.0% | 0.0% |
| Big Thicket Lake Estates | TX | 742 | 0 | 0.0% | 0.0% |
| Hillcrest | TX | 730 | 730 | 0.0% | 100.0% |
| Cove | TX | 682 | 682 | 0.0% | 100.0% |
| Simonton | TX | 662 | 662 | 0.0% | 100.0% |
| Pattison | TX | 628 | 628 | 0.0% | 100.0% |
| Stagecoach | TX | 603 | 603 | 0.0% | 100.0% |
| Liverpool | TX | 551 | 551 | 0.0% | 100.0% |
| North Cleveland | TX | 288 | 288 | 0.0% | 100.0% |
| Morgan's Point | TX | 273 | 273 | 0.0% | 100.0% |
| Bonney | TX | 202 | 202 | 0.0% | 100.0% |
| Thompsons | TX | 184 | 184 | 0.0% | 100.0% |
| Dayton Lakes | TX | 57 | 0 | 0.0% | 0.0% |
City population is shown in full; each city's share inside 621 is measured from Census tract centroids.
What counties does area code 621 cover?
| County | State | Population in 621 | % of area-code footprint | % of County |
|---|---|---|---|---|
| Harris County | TX | 4,715,685 | 74% | 100% |
| Fort Bend County | TX | 804,574 | 13% | 98% |
| Montgomery County | TX | 345,035 | 5% | 56% |
| Brazoria County | TX | 244,089 | 4% | 66% |
| Galveston County | TX | 190,638 | 3% | 54% |
| Liberty County | TX | 38,207 | 1% | 42% |
| Chambers County | TX | 33,525 | 1% | 72% |
| Waller County | TX | 20,984 | 0% | 37% |
| San Jacinto County | TX | 7,974 | 0% | 29% |
Sources:
- Census PEP Vintage 2024 (city populations)
- · 2020 Census tract centroids with NANP and TIGERweb boundaries (footprint, counties, city shares)
- · NANPA NPA report (dates)
- · Methodology
Has area code 621 been reported for unwanted calls?
Yes – 6 FTC complaints, Jun 8 – Aug 25, 2026.
- 100% robocalls
- → 0% vs prior period
- FTC data, retrieved 2026-10-05
Most-reported subjects
- Reducing your debt (credit cards, mortgage, student loans)67%4
- Medical & prescriptions17%1
- Other17%1
Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints.
Frequently Asked Questions about the 621 Area Code
Who called me from a 621 number?
Its 101 cities are led by Houston, Pasadena, and Pearland.
Why do I keep getting calls from the 621 area code?
Complaints were level with the prior period (0%).
Should I answer an unknown 621 number?
100% of its FTC complaints were robocalls. Its most-reported subject was "Reducing your debt (credit cards, mortgage, student loans)", at 67%.
How do I block calls from the 621 area code?
Blocking 621 still lets 281, 346, 713, and 832 numbers through.
Where is area code 621?
621 covers 101 cities and 6,400,711 residents in 9 Texas counties, led by Harris, Fort Bend, and Montgomery.
When did area code 621 go into service?
621 went into service on January 23, 2025. It was added to overlay 346. 281, 713, and 832 also share its territory.
Is 621 a real area code?
Yes: 101 cities in Harris, Fort Bend, Montgomery, and 6 other counties use it.
What timezone is the 621 area code in?
621 is on Central Time (CT).
How do I call a 621 number from abroad?
Dial +1 621, then the number.