Area Code 7138 – Texas
The phone area code for Texas is 7138 (international format +17138). Browse local exchange codes (NXX) and carrier assignments below.
📍 Geographic Location of Texas
Overview of Area Code 7138
Area code 7138 is a geographic prefix within the North American Numbering Plan (NANP), serving the state of Texas. Specifically, it is part of the 713 numbering plan area (NPA), which covers the city of Houston and its immediate surrounding areas, including communities such as Bellaire, Bunker Hill Village, Hedwig Village, Hilshire Village, Hunters Creek Village, Jersey Village, Katy (partial), Piney Point Village, Southside Place, Spring Valley Village, and West University Place. The 713 area code is one of the original area codes assigned in 1947 and has undergone several overlays to accommodate growth.
When dialing a number with the 7138 prefix, callers must use the full 10-digit dialing format (area code + 7-digit local number) for all calls, including local calls within the same area code, due to the overlay of multiple area codes in the region. For international callers, the format is +1 713 8XX XXXX, where +1 is the country code for the United States, 713 is the area code, and 8XX XXXX is the local subscriber number.
Dialing Instructions
- Local calls (within 713 area): Dial 713-8XX-XXXX (10-digit dialing is mandatory).
- Long-distance calls within the US/Canada: Dial 1-713-8XX-XXXX.
- International calls to this number: Dial your country's exit code, then 1-713-8XX-XXXX (e.g., from the UK, dial 00-1-713-8XX-XXXX).
- Example: +1 713 8XX XXXX (replace X with actual digits).
Geographic and Regulatory Context
The 713 area code is administered by the Texas Public Utility Commission and is subject to NANP regulations. The 7138 prefix is allocated to wireline and wireless carriers serving the Houston metropolitan area. As a geographic code, it is tied to a specific rate center, which affects local calling areas and emergency services routing. Businesses and residents in this region often use 713 numbers to establish a local presence, and number portability allows customers to retain their 7138 numbers when switching providers.
For callers outside the United States, it is essential to note that the plus sign (+) in international dialing represents the international access code, which varies by country. Always verify the correct exit code before dialing. Additionally, be aware of potential scams: never share personal information with unknown callers, and verify the legitimacy of any unsolicited calls from this prefix.