Area Code 90 – Uusimaa
The phone area code for Uusimaa is 90 (international format +35890). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 90
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Uusimaa
Geographic Overview
The +358 90 prefix is the geographic area code for Helsinki, the capital of Finland, and the surrounding Uusimaa region. This area code is assigned to the Helsinki Telephone Corporation (Elisa) and serves the country's most densely populated area, including major municipalities such as Espoo, Vantaa, and Kauniainen. As the primary economic and administrative hub of Finland, the 90 area code hosts a dense concentration of government institutions, corporate headquarters, and residential subscribers.
Dialing Formats
When calling a landline in Helsinki from within Finland, subscribers must dial the national trunk prefix 0 followed by the area code and the subscriber number. For example, a local Helsinki number might be dialed as 09 123 456. However, from outside Finland, the leading zero is omitted, and the number is dialed as +358 9 123 456. It is important to note that the area code is an integral part of the subscriber number; it cannot be omitted even for local calls.
Numbering Structure
Finnish geographic numbers, including those under the 90 prefix, typically consist of 5 to 8 digits after the area code. The total length of the national significant number (NSN) for Finnish landlines is usually 9 digits, including the leading trunk prefix. The 90 area code is not overlaid with any other code, and no area code changes are planned. Subscribers in the Helsinki region retain their numbers when moving within the same exchange area, but number portability allows users to switch operators while keeping their numbers.
Caller Instructions
For callers within Finland, simply dial 09 followed by the local number. For international callers, dial your country's exit code (e.g., 00 from most European countries, 011 from North America), then 358, then 9, followed by the local number. For example, to call a Helsinki landline from the United States, you would dial 011 358 9 123 456. Mobile callers in Finland can also reach these numbers by dialing the full national format.
Regulatory and Technical Notes
The Finnish Communications Regulatory Authority (FICORA) oversees the national numbering plan in accordance with ITU-T E.164 recommendations. Geographic numbers are used primarily for fixed-line services, but they may also be assigned to VoIP providers that offer fixed-line replacements. When calling from abroad, be aware that some service providers may charge higher rates for calls to geographic numbers in Finland, and it is always advisable to check with your carrier for applicable international tariffs.