1. Your CIF(Customer Information File*) number is there on your Pass Book.
2. If you are keeping any Fixed Deposits with the branch, it will also be there on the Fixed Deposit Receipts.
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*Customer Information File (CIF)
-Computerized accounting system that maintains a record of a bank's customers including such information as deposit accounts owned, credit relationships, trust accounts, joint ownership of accounts, and so on. The CIF is a bank's customer control file, allowing the bank to look at its customers by total relationship, rather than single accounts (checking, savings). It is updated periodically, frequently daily, to reflect changes as new accounts are opened, checks written, and loan payments made.
-Read more: http://www.answers.com/topic/customer-information-file-cif#ixzz2M4u9IGLc