Area Code 15 – Vienna
The phone area code for Vienna is 15 (international format +4315). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 15
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Vienna
Geographic Overview
The Austrian area code +43 15 is a geographic National Destination Code (NDC) assigned to the capital city, Vienna (Wien). This code is part of the Vienna telephone network, which historically used the prefix 01 for local calls within Austria. The 15 prefix is a sub-range of the Vienna numbering plan, serving specific districts or exchanges within the city. Vienna, as the national capital and largest city, hosts a dense concentration of government institutions, corporate headquarters, and residential areas, all of which may be reached via numbers beginning with +43 15.
Dialing Formats
When calling a Vienna number that starts with 15 from abroad, you must dial the international access code (e.g., 00 from most countries), followed by Austria's country code 43, then the NDC 1 (dropping the leading zero), and finally the subscriber number. For example, a local Vienna number might be 01 5XX XXXX in national format. To call this number from the United States, you would dial: 011 43 1 5XX XXXX. From within Austria, but outside Vienna, you would dial 01 5XX XXXX. Within Vienna, the local number can often be dialed without the area code, depending on the specific number range and local dialing rules.
Numbering and Overlays
Austria's numbering plan is regulated by the national regulatory authority, RTR (Rundfunk und Telekom Regulierungs GmbH). The Vienna area code 1 is one of the few geographic codes in Austria that has not undergone an overlay, meaning that the area code remains mandatory for all calls from outside the local area. The 15 prefix is not a separate overlay but rather a block of numbers within the Vienna NDC. Subscriber numbers in Vienna can vary in length, but when combined with the NDC, the total national significant number is typically 9 to 11 digits.
Caller Instructions
For local callers within Vienna, dialing the 8-digit subscriber number (starting with 5) may suffice for calls within the same local network. However, to avoid confusion, it is recommended to always use the full national format 01 5XX XXXX when dialing from a mobile phone or from outside the immediate local area. International callers must always include the country code and NDC, omitting the leading zero. It is important to note that numbers beginning with +43 15 are not toll-free or premium; they are charged as standard geographic calls, and rates depend on the caller's telecom provider and calling plan.