Area Code 21 – Lausanne
The phone area code for Lausanne is 21 (international format +4121). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 21
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Lausanne
Geographic Coverage and Administrative Jurisdiction
The Swiss area code +41 21 is a geographic National Destination Code (NDC) assigned to the canton of Vaud, with its primary hub in the city of Lausanne, the canton's capital. The numbering area extends across the Lake Geneva region, including major municipalities such as Montreux, Vevey, Nyon, and Morges, as well as the surrounding French-speaking communities. This code is administered by the Swiss Federal Office of Communications (OFCOM) and is allocated exclusively to fixed-line services, although some Voice over IP (VoIP) providers may assign numbers with this prefix to subscribers with a physical presence in the region.
Dialing Formats and Caller Instructions
For local callers within Switzerland, the number must be dialed in the national format: 021 XXX XX XX (the leading '0' is the trunk prefix). When calling from abroad, the international format applies: +41 21 XXX XX XX, where the trunk prefix is omitted. For example, a fixed-line number in Lausanne might be +41 21 312 34 56. It is important to note that Swiss fixed-line numbers are not portable to mobile networks, and mobile numbers in Switzerland always begin with '7x' (e.g., 076, 078, 079).
Overlay and Numbering Plan Considerations
Switzerland does not use overlay codes; each geographic region has a unique NDC. The 021 area code is closed, meaning no new geographic numbers are being issued in this range, but existing numbers remain active. The maximum length of a Swiss phone number is 9 digits after the country code, including the NDC. For instance, +41 21 312 34 56 has 9 digits after +41 (21 312 34 56).
Practical Usage and Business Implications
Businesses operating in the Lausanne area often use 021 numbers to establish a local presence. For international callers, it is essential to replace the leading '0' with the country code +41. When dialing from a mobile phone in Switzerland, the same national format applies. For VoIP users, it is advisable to store numbers in international format (+41 21...) to ensure proper routing across different networks.
Understanding the correct dialing procedures helps avoid call failures and ensures efficient communication with the French-speaking region of Switzerland.