North American Numbers Source-cited · ownership disclosed
Area code
346
In service
United States · since 2014

Houston (overlay)

The fourth Houston overlay, added in 2014 over the same territory as 713/281/832. Has no distinct geography of its own.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Houston (overlay)
Type
geographic
Status
in service
In service since
2014
Projected exhaust
2039 Q2

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 346 is

Greater Houston metropolitan area, Texas (same footprint as 713/281/832/621).

Communities served wholly or partly by 346:

HoustonKatyThe WoodlandsSugar LandPearlandBaytownConroe

Representative; as an overlay it has no unique sub-region.

B · Relationships

How it relates to other codes

The codes 346 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2014 713 Houston 346 added as a fourth overlay of the 713/281/832 Houston complex.
Overlay · 2014 281 Houston Co-overlay of the same region.
Overlay · 2014 832 Houston (overlay) Co-overlay of the same region.
Overlay · 2025 621 Houston (overlay) 621 joined the same complex as the fifth code in 2025.
What's changing. Member of the 713/281/832/346/621 all-services overlay. Mandatory 10-digit dialing.
C · History

How 346 got here

2013-05-09
Texas PUC announced the fourth Houston overlay, 346.
Source: Wikipedia (Area codes 713, 281, 832, 346, and 621)
2014-07-01
Area code 346 entered service.
Source: Wikipedia (Area codes 713, 281, 832, 346, and 621)
D · Capacity

How full it is

Prefixes assigned
766
Prefixes available
34
Thousands-blocks assigned
7,234

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 346 with another code →
Sources
Wikipedia ↗
Area codes 713, 281, 832, 346, and 621
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.