Listings of bank routing numbers for banks in the United States are available online. Websites that offer a searchable list of bank routing numbers include US-Routing-Numbers.com, BankRoutingNumber.us and ABA.com.
At US-Routing-Numbers.com, users find routing numbers for all FedACH banks in the United States. Major banks, such as Bank of America and Capital One, have a separate link that lists their routing numbers. Other numbers can be searched by bank name.
Routing numbers can be searched on BankRoutingNumber.us by entering a state, city and bank name.
The website for the American Bankers Association, ABA.com, offers a bank routing number lookup by financial institution name and state. A reverse lookup using the routing number to find a bank name is also offered.
Bank routing numbers are used to identify the specific financial institution responsible for the payment of a check or other negotiable instrument.