Area Code 42 – Keflavík
The phone area code for Keflavík is 42 (international format +35442). Browse local exchange codes (NXX) and carrier assignments below.
📍 Geographic Location of Keflavík
The +354 42 prefix is a geographic National Destination Code (NDC) assigned to the Reykjanes region in southwestern Iceland, specifically serving the town of Keflavík and its immediate surroundings. Keflavík, now part of the larger Reykjanesbær municipality, is historically significant as a fishing and commercial hub and is closely associated with the nearby Keflavík International Airport (KEF), Iceland's primary gateway for international flights. The numbering area covers the urban center of Keflavík, including districts such as Innri-Njarðvík and portions of the Reykjanesbær administrative area. As a geographic code, +354 42 is tied to a fixed-line infrastructure, typically provided by Icelandic telecom operators such as Síminn, Vodafone Iceland, and Nova, and is used for residential and business landlines, as well as some fixed wireless and VoIP services that retain a geographic presence.
When dialing a number in Keflavík from abroad, the international format is +354 42X XXXX, where the complete national significant number (NSN) is 7 digits, beginning with the two-digit prefix 42. For example, a local Keflavík number might be +354 421 2345. Within Iceland, callers must dial the full 7-digit number without any trunk prefix, as Iceland uses a closed numbering plan. Thus, a domestic call to the same number would simply be 421 2345. There is no separate local dialing code; the prefix is part of the national number.
It is important to note that Iceland does not use area code overlays, and the 42 prefix is exclusively associated with the Keflavík area. However, number portability allows subscribers to retain their numbers when moving to other geographic locations or switching to VoIP providers, which means that a number with the 42 prefix may occasionally be served from a different physical location. For callers, this does not affect dialing procedures. For businesses, having a +354 42 number reinforces a local presence in Keflavík, which can be advantageous for customer trust and regional marketing. As with all Icelandic numbers, the country's telecommunications regulator, Fjarskiptastofa, oversees the allocation of prefixes, ensuring efficient and orderly use of the national numbering plan.