Area Code 2457 – Windsor
The phone area code for Windsor is 2457 (international format +612457). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2457
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Windsor
Geographic Overview
The Australian area code +61 2 457 is a geographic National Destination Code (NDC) segment within the larger Sydney metropolitan numbering area. Specifically, this prefix serves the Windsor region, located in the Hawkesbury district on the northwestern fringe of Greater Sydney, New South Wales. The code covers Windsor, South Windsor, Bligh Park, McGraths Hill, and surrounding semi-rural localities. As part of the 02 geographic numbering zone, it is administered under the Australian Communications and Media Authority (ACMA) numbering plan.
Dialing Formats
For local callers within Australia, the number is dialed in its full national format: (02) 457X XXXX. The leading '0' is the national trunk prefix, and '2' is the geographic area code for Central East (Sydney). International callers must replace the trunk prefix with Australia's country code +61, omitting the initial zero: +61 2 457X XXXX. For example, a local Windsor number might be (02) 4572 1234, which becomes +61 2 4572 1234 from overseas.
Numbering and Overlay
Numbers within this prefix are standard 10-digit national significant numbers (NSN), comprising the area code '2' followed by an 8-digit subscriber number. The 02 area code is not subject to an overlay in the traditional sense; however, due to the expansion of the Sydney metropolitan area, some regional centers share the 02 code. The Windsor prefix is specifically allocated to fixed-line services, including PSTN and VoIP services, and is not portable to mobile networks. Callers should note that local calls within the 02 region may be charged as local or national depending on the carrier, but calls to this prefix from other Australian states are generally considered national calls.
Caller Instructions
For local callers within the Windsor area, it is common to dial only the 8-digit subscriber number for local calls, but the recommended practice is to always use the full national format to avoid misdialing. For international callers, ensure you have the correct country code (+61), drop the leading '0', and then dial the area code and subscriber number. For example, to call a Windsor number from the United States, you would dial 011 61 2 457X XXXX. From the United Kingdom, it would be 00 61 2 457X XXXX.
Regulatory and Technical Notes
As with all Australian geographic numbers, the allocation of this prefix is managed by the ACMA, and carriers must ensure compliance with the Numbering Plan. The Windsor region is served by both the National Broadband Network (NBN) and legacy copper networks, with most services now operating over VoIP infrastructure. However, the geographic significance of the prefix remains for emergency services and caller line identification purposes.