Area Code 1 – Dublin
The phone area code for Dublin is 1 (international format +3531). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 1
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Dublin
Geographic Overview
The +353 1 area code is the National Destination Code (NDC) for the Greater Dublin Area in the Republic of Ireland. This geographic allocation encompasses the capital city, Dublin, along with its surrounding counties, including parts of County Dublin (Dublin City, Dún Laoghaire–Rathdown, Fingal, and South Dublin), as well as adjacent areas in County Wicklow and County Kildare that fall within the extended metropolitan region. The code serves a dense mix of residential, commercial, and government districts, with major business hubs such as the International Financial Services Centre (IFSC), Dublin Docklands, and technology campuses in Sandyford and Citywest.
Dialing Formats
When calling a Dublin number from within Ireland, subscribers must dial the trunk prefix 0 followed by the area code and the subscriber's seven-digit local number: 01 XXX XXXX. For international callers, the format is +353 1 XXX XXXX (or 00353 1 XXX XXXX from many countries). The seven-digit subscriber number is not geographically segmented; the entire sequence is required to complete the call.
Numbering and Overlay
Ireland's national numbering plan is regulated by the Commission for Communications Regulation (ComReg). The 01 area code is a closed numbering plan, meaning that all local numbers have a fixed length of seven digits. There is no overlay code for Dublin; the 01 code remains the sole geographic code for the region. However, due to number exhaustion, ComReg has implemented number conservation measures, and some new services may be assigned non-geographic codes (e.g., 0818, 076) for VoIP or national rate services.
Caller Instructions
- Local callers: When dialing a Dublin number from within the same area code, the full national format (01 XXX XXXX) is still required; local dialing without the area code is not permitted.
- Callers from other Irish regions: Dial 01 followed by the seven-digit number.
- International callers: Dial the international access prefix (e.g., 00 from most countries) or '+', then 353, then 1, and the seven-digit number. Do not include the leading '0' used in national dialing.
This code is used for both fixed-line PSTN and VoIP services, and number portability allows subscribers to retain their 01 number when switching providers. For businesses, a Dublin number enhances local presence and is often used for customer service lines, though it is not toll-free.