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621 Area Code

Area Code Overview

Area code 621 is a geographic telephone area code in Texas that went into service on January 23, 2025. The geographic regions covered by this area code overlay has a population of approximately 3,453,395.

Overlay and Dialing Rules

  • Area Code: 621
  • State: Texas
  • Type: General Purpose Code
  • In Service Date: January 23, 2025
  • Overlay Complex: 281/346/621/713/832
  • Local Dialing Plan: This area does require you to dial the area code when calling locally.

Estimated Number of Assigned Phone Numbers in Area Code 621

0

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 621

No usage distribution is available for this area code.

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 621

Estimated assigned wireless phone numbers: 0

Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.

No wireless provider distribution is available for this area code.

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 621

Estimated assigned wireline and VoIP phone numbers: 0

No wireline or VoIP provider distribution is available for this area code.

Other / Unclassified Assigned Numbering in Area Code 621

Estimated assigned other or unclassified phone numbers: 0

No other or unclassified provider distribution is available for this area code.

Cities and Towns in Area Code 621

Alvin, Texas Arcola, Texas Barker, Texas Baytown, Texas Beach City, Texas Brookshire, Texas Channelview, Texas Cleveland, Texas Crosby, Texas Cypress, Texas Deer Park, Texas Dickinson, Texas Friendswood, Texas Highlands, Texas Houston, Texas Huffman, Texas Humble, Texas Katy, Texas Kemah, Texas La Porte, Texas League City, Texas Liverpool, Texas Manvel, Texas Missouri City, Texas Mont Belvieu, Texas Pinehurst, Texas Porter Heights, Texas Porter, Texas Richmond, Texas Rosharon, Texas Satsuma, Texas Seabrook, Texas Sheldon, Texas Smith, Texas Splendora, Texas Spring, Texas Stafford, Texas Sugar Land, Texas Tomball, Texas Valley Lodge, Texas Westfield, Texas

These geographic regions are also served by area codes 281, 346, 713, and 832.

How These Figures Were Built

These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 621, not live customer counts.

Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.

They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.

Population data and locality matching provided by GeoNames.

Last refreshed: April 15, 2026 6:22 pm