Area code 621

About area code 621

NANPA lists 621 as an in-service geographic area code for Texas, first put into service on January 23, 2025. It is an overlay: 621 and 281, 346, 713, and 832 cover the same territory, so neighbors on the same street can have different area codes. It is in the Central time zone.

How calls are dialed in 621

According to NANPA's dialing-plan data, local calls within 621 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits. Because local calls need the area code, business cards, signage and website copy should always show the full ten-digit number. NANPA's dialing-plan note for this code reads: "1+10 digit permissible at service provider discretion."

A new code in an overlay

NANPA's utilized-code file dated 10/01/2026 lists no central office codes assigned in 621 yet. NANPA assigned the code on October 13, 2023 and put it in service on January 23, 2025. In an overlay, numbers for the shared territory keep coming from the older codes (281, 346, 713, and 832) until carriers start drawing codes from 621, so a business phone number requested here today will most likely carry one of those codes.

281 has been in service since November 2, 1996 and has 786 assigned codes held by 28 carriers across 45 rate centers. Its largest code holders are Southwestern Bell (283), Cellco Partnership d/b/a Verizon Wireless - TX (66), and Frontier Southwest INC d/b/a Frontier Comm of Texas (57). Its most populous matched places are Houston (2.4 million), League City (118,000), Sugar Land (110,000), and Baytown (86,004).

346 has been in service since July 1, 2014 and has 752 assigned codes held by 56 carriers across 45 rate centers. Its largest code holders are Onvoy, LLC - TX (133), Aerial Communications, INC. (121), and New Cingular Wireless PCS, LLC - Il (88). Its most populous matched places are Houston (2.4 million), League City (118,000), Sugar Land (110,000), and Baytown (86,004).

713 has been in service since January 1, 1947 and has 785 assigned codes held by 29 carriers across 19 rate centers. Its largest code holders are Southwestern Bell (470), Spok, INC. (62), and New Cingular Wireless PCS, LLC - Il (55). Its most populous matched places are Houston (2.4 million), League City (118,000), Sugar Land (110,000), and Baytown (86,004).

832 has been in service since January 16, 1999 and has 786 assigned codes held by 31 carriers across 43 rate centers. Its largest code holders are Aerial Communications, INC. (177), New Cingular Wireless PCS, LLC - Il (147), and Southwestern Bell (83). Its most populous matched places are Houston (2.4 million), League City (118,000), Sugar Land (110,000), and Baytown (86,004).

Adding an overlay leaves existing numbers unchanged: nobody has to switch numbers, but local calls need all ten digits, and new lines can start with either code.

Places in the 621/281/346/713/832 territory

25 Census places are matched to rate centers with exchanges in 281, 346, 713, and 832, the codes 621 overlays. The most populous are Houston (2.4 million), League City (118,000), Sugar Land (110,000), and Baytown (86,004). Their pages list the prefixes and carriers that serve each town today; numbers from 621 will appear alongside them as carriers draw new codes.

Getting a 621 number for your business

For $99 a month, Callata puts a team of up to 5 on one plan ($20 for each person after that): up to 3 local numbers, unlimited inbound calls, a pooled allowance of 1,500 outbound US and Canada minutes per user, browser and cell calling, voicemail transcription with urgency triage, recorded calls with AI summaries and business-hours routing, with E911 on every number.

Porting a number you already use in area code 621 is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.