Area Code 8840 – Adelaide
The phone area code for Adelaide is 8840 (international format +618840). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 8840
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Adelaide
Geographic Coverage and Administrative Jurisdiction
The Australian area code +61 8840 is a geographic National Destination Code (NDC) allocated within the South Australian numbering plan. It specifically serves the Adelaide metropolitan area, including the central business district and surrounding suburbs. As a geographic code, it is tied to the physical location of the fixed-line service, and its use is regulated by the Australian Communications and Media Authority (ACMA). The code is part of the larger 8-series block assigned to Adelaide, which also includes codes like 8841, 8842, and others.
Dialing Formats and Caller Instructions
For local callers within Australia, the number is dialed as 08 8840 XXXX (with the leading trunk prefix '0' and the area code '8' for South Australia). For international callers, the number is dialed as +61 8 8840 XXXX (dropping the leading '0'). The full national significant number (NSN) is 10 digits, including the area code. For example, a typical number might be +61 8 8840 1234.
When calling from a mobile phone within Australia, it is essential to include the area code even if the caller is in the same region, as mobile numbers do not require the trunk prefix but the fixed-line number does. For international callers, the plus sign (+) represents the international access code, which varies by country (e.g., 011 from the US, 00 from most European countries).
Overlay and Numbering Considerations
Adelaide has not undergone an area code overlay; the 08 area code remains the sole geographic code for South Australia. However, within the 08 code, multiple NDCs (such as 8840) are used to manage numbering capacity. This means that local calls within Adelaide may require dialing the full 10-digit number (including the area code) in some cases, especially for new services. The ACMA has mandated 10-digit dialing for all fixed-line calls in Australia since 1997, so callers must always include the area code.
Services and Usage
Numbers with the 8840 prefix are typically assigned to fixed-line PSTN and VoIP services. They are used by businesses and residents in Adelaide. Because it is a geographic number, it is not portable to other regions, but it can be ported between service providers within the same geographic area. For businesses, having a local Adelaide number can enhance local presence and customer trust.