Area Code 740 – Letterkenny
The phone area code for Letterkenny is 740 (international format +353740). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 740
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Letterkenny
Geographic Overview
The +353 740 area code is a geographic National Destination Code (NDC) assigned to the town of Letterkenny, located in County Donegal in the northwest of Ireland. This code serves the administrative and commercial hub of the county, along with its immediate hinterland. Letterkenny is the largest town in County Donegal and functions as a key economic and retail center for the region. The geographic area covered by the 740 prefix includes the town itself and surrounding suburban and rural areas that form part of the local exchange area.
Dialing Formats
For callers within Ireland, the national dialing format requires the leading trunk prefix '0' followed by the area code and the subscriber number. For example, a local Letterkenny number might be dialed as 074 9123456 (where '074' is the national dialing code, and '9123456' is the 7-digit subscriber number). Note that the international format omits the leading '0', so the same number would be dialed from abroad as +353 74 9123456. It is important to note that the Irish national dialing code for Letterkenny is '074', but the international country calling code is +353, and the NDC is '74' (without the leading zero). The prefix '740' is part of the larger '074' numbering area, which covers a wider region in County Donegal.
Caller Instructions
Local callers within the 074 area can often dial the 7-digit subscriber number directly without the area code, depending on the specific local network configuration. However, for clarity and to avoid misdialing, it is recommended to always use the full national format. Callers from outside Ireland must use the international format: +353 74 followed by the subscriber number. When calling from a mobile phone, the plus sign (+) is typically used to denote the international access code, but if dialing from a landline, you may need to replace '+' with the international exit code of your country (e.g., '00' in most European countries).
Numbering and Overlay Considerations
Irish geographic numbers are not portable outside their designated exchange area, but they can be ported between operators within the same area. There are currently no overlay codes for the 074 area, meaning that the area code is not shared with other geographic codes. The number length for geographic numbers in Ireland is typically 7 to 8 digits (excluding the leading '0'), and the total international number length is 9 to 10 digits after the country code. This structure complies with ITU-T E.164 recommendations.
Practical Usage
Businesses and residents in Letterkenny use the 740 prefix for fixed-line services, including PSTN and VoIP. When marketing or publishing contact details, it is essential to present numbers in international format (+353 74 ...) to ensure accessibility for global clients. For example, a local business might list its number as +353 74 9123456 on its website to facilitate calls from abroad.