Routing Number
Definition
A routing number (ABA RTN) is a unique 9-digit code that identifies a U.S. financial institution. Created by the American Bankers Association (ABA), these numbers serve as a bank's address within the banking system.
Usage
Routing numbers are essential for:
- Direct deposits
- Wire transfers
- Electronic bill payments
- Processing checks
- ACH transactions
Structure
The 9-digit number consists of:
- First four digits: Federal Reserve routing symbol
- Next four digits: Institution identifier
- Final digit: Check digit for verification
Regional Application
Routing numbers are used exclusively in:
- United States
- U.S. territories
Important Notes
A single bank may have multiple routing numbers based on:
- Geographic location
- Type of transaction (wire transfer vs. direct deposit)
- When the account was opened