ION Bank Routing Number

What is an ABA routing number?

An ABA routing number, also called a routing transit number (RTN), is a 9-digit code that identifies a U.S. financial institution in the payment system. It tells ACH transfers, Fedwire payments, and paper checks which bank to route money to. The format was created by the American Bankers Association in 1910 and is still the backbone of U.S. domestic payments.

What is the difference between a routing number and an account number?

Your routing number identifies the bank; your account number identifies your specific account at that bank. On a paper check, the routing number is the 9-digit number in the bottom-left, and the account number is to its right.

What is the ION Bank routing number?

The ION Bank routing number is 211174178. It is the primary ABA routing transit number registered to ION Bank, headquartered in Naugatuck, CT. A bank can hold more than one routing number, so this is the one on record for the institution, not necessarily the one printed on every check. The number comes from the FFIEC National Information Center institution record, last refreshed here on October 8, 2026.

What is the ION Bank wire routing number?

This page lists 211174178, the primary routing number registered to ION Bank. The record does not say whether the bank uses the same number for wire transfers, and many banks use a separate routing number for domestic wires. Confirm the wire routing number with ION Bank before sending a wire.

Is ABA number 211174178 the routing number for ION Bank?

Yes. ABA number 211174178 is the primary routing number registered to ION Bank. Check it against the routing number on a check or in your online banking before sending an ACH payment, because a bank can use different numbers by region or product.

Which bank uses routing number 211174178?

Routing number 211174178 belongs to ION Bank, headquartered in Naugatuck, CT. It is the bank's primary ABA routing number (FDIC certificate 18198).

Routing numbers of similar-size institutions in Connecticut

Credit union, East Hartford, CT

American Eagle Financial Credit Union, Inc.: 211176891

Credit union, Hartford, CT

Connecticut State Employees Credit Union, Inc.: 211977197

Bank, Stamford, CT

First County Bank: 221172212

Bank, Danbury, CT

Union Savings Bank: 221172241

Bank, New Canaan, CT

Bankwell Bank: 021113662

Bank, Thomaston, CT

Thomaston Savings Bank: 211174259

Bank, Ridgefield, CT

Fairfield County Bank: 221172270

Bank, Newtown, CT

Newtown Savings Bank: 221172296

All routing numbers in Connecticut