Area Code 65 – Mato Grosso
The phone area code for Mato Grosso is 65 (international format +5565). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 65
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Mato Grosso
Geographic Coverage and Administrative Scope
The Brazilian area code 65 is a geographic National Destination Code (NDC) assigned to the central-western state of Mato Grosso. It serves the state capital, Cuiabá, and its metropolitan region, including Várzea Grande, as well as a significant number of municipalities across the state. The code covers a vast territory that borders Bolivia and other Brazilian states, playing a key role in agribusiness and logistics. The numbering area is administered under the national numbering plan regulated by ANATEL (Agência Nacional de Telecomunicações).
Dialing Formats and Caller Instructions
For local calls within the 65 area, callers must dial the eight-digit subscriber number preceded by the area code. For example, to call a landline in Cuiabá from another city within the same code, you would dial: 65 3621-0000. For international callers, the format follows the ITU-T E.164 standard: the Brazilian country code +55, followed by the area code 65 and the eight-digit local number. Thus, a call from abroad would be placed as +55 65 3621-0000. When calling from a mobile phone in Brazil to a number in the 65 area, the same format applies: 65 3621-0000 (without the leading zero).
Mobile and Overlay Considerations
It is important to note that the 65 code is also used for mobile numbers in the region. Mobile numbers in Brazil are nine digits, starting with the digit '9'. For example, a mobile number in Cuiabá would be formatted as 65 99999-0000. There is no overlay code in this area; the 65 code serves both fixed and mobile services. However, mobile number portability allows users to retain their numbers when switching operators, but the geographic code remains tied to the original region. For calls from other Brazilian area codes, the same dialing procedure applies: dial the area code and the number. For instance, a caller in São Paulo (11) would dial 65 3621-0000 to reach a landline in Cuiabá.
Regulatory and Technical Notes
Since 2016, ANATEL has mandated that all intercity calls (including those from mobile to fixed) require the use of the area code, and the prefix '0' is no longer used for domestic long-distance calls. International callers must replace the '+' with their international access prefix (e.g., 00 from many countries) when dialing from a landline, but mobile users can simply use the '+55' format. The 65 code is part of the national numbering plan and is subject to periodic reviews by ANATEL to ensure numbering efficiency. For businesses, using a local presence number in the 65 area can enhance customer trust and accessibility, especially for companies targeting the Mato Grosso market.