The ABA Routing Number Policy governs which US institutions may receive routing numbers and how assignments change, merge or retire. It links the nine-digit identifier to its current institution, helping payment providers maintain routing directories as banks reorganise or close.
TL;DR:
- ABA policy governs assignment and administration of US routing numbers.
- It distinguishes regular routing numbers from special-purpose identifiers.
- A routing number identifies an institution and grants neither ownership nor banking powers.
Summary
Purpose And Governance
The American Bankers Association's policy governs the management and use of routing numbers for efficient cheque and electronic-payment delivery. The Routing Number Administrative Board oversees the policy and the official registrar's administration. An ABA routing number identifies the institution responsible to pay, credit or receive the relevant transaction; it is distinct from the customer account number identifying an account within that institution.
Eligibility And Identifier Classes
Regular routing-number eligibility rests on the criteria in the policy, including eligibility to maintain a Federal Reserve Bank account for qualifying banks. The policy separately defines Electronic Transaction Identifiers for non-bank processors acting for banks and identifiers for travellers' cheques. An ETI is an electronic address and does not identify the institution obliged to settle, so substituting it for the paying bank's identifier would misstate its role.
Assignment And Change
Eligible institutions can receive a principal-office number and qualifying additional numbers, with further assignments requiring Board approval. The nine-digit structure contains a routing symbol, institution identifier and check digit. Administration covers issuance, use, changes and retirement, including circumstances arising from mergers or reorganisations. A retained number therefore needs the correct current institution and presentment information rather than reliance on historical ownership assumptions.
Authority And Revision
Assignment does not expand an institution's chartered powers or make the number its transferable property. The registrar-hosted policy PDF carries an internal revision of September 2025 even though its filename includes 2026. That internal marking is the relevant version evidence. The policy establishes identifier governance, not permission to provide every payment service or a guarantee that an assigned number supports every payment channel.
Keywords
- Routing Numbers
- Institution Identifier
- Number Assignment
- Official Registrar
- Eligibility
- ETI
- Check Clearing
- ACH Routing
- Number Retirement
- United States