BSB Number means Bank State Branch (BSB) number which is a 6 digit bank code that identifies an individual branch of a bank and other financial institutions within Australia. This six digit number (BSB) plus the account number used to identify a particular account. BSB Numbers with account numbers combinations are used in domestic transaction only. For international transfers, a SWIFT code is also used in addition to the BSB number and a bank account number.

You may verify the BSB number by using the BSB lookup tool on bsbno.com –

BSB Number Lookup

The 6 digit BSB number is made up of three parts: AAB-CCC

The first two numbers (AA) specify the financial institution/bank.
The third number (B) indicates the state where the branch is located.
The last three numbers (CCC) are the unique identifier for a branch.

Financial Institution Codes (AA – First two Numbers)

Number Code Bank Name
1 ANZ Australia and New Zealand Banking Group Ltd
03 or 73 WBC Westpac Banking Corporation
06 or 76 CBA Commonwealth Bank of Australia
08 or 78 NAB National Australia Bank
10 BSA BankSA
11 STG St George Bank
12 BQL Bank of Queensland
18 MBL Macquarie Bank
24 CTI Citibank
30 BWA Bankwest
34 HBA HSBC Bank Australia
48 MET Suncorp-Metway
61 Adelaide Bank
633 BBL Bendigo Bank
923 ING ING Bank

State Codes (B – Third Number)

Code State
2 Australian Capital Territory, New South Wales
3 Victoria
4 Queensland
5 South Australia & Northern Territory
6 Western Australia
7 Tasmania

Therefore, the BSB number for the Bankwest store in Perth, Western Australia (which has the identifying number 059), would be 306-059.

AA = 30 (Bankwest)
B = 6 (WA)
CCC = 059 (Perth)