BMO Routing Numbers in Illinois

BMO has 140 routing numbers registered in Illinois. When setting up direct deposit, bill pay, or wire transfers, make sure to use the routing number assigned to your specific branch or account — using the wrong one can delay or reject your transaction.

Your routing number appears on the bottom-left of any BMO check, in the BMO mobile app under account details, or by calling BMO at 855-259-8521. For ACH transfers like direct deposits and bill payments, use your state-specific routing number. For domestic wire transfers, BMO may use a different number — always confirm with the bank before sending a wire.

The reason BMO has multiple routing numbers in Illinois is typically due to historical mergers and acquisitions. When banks merge, the acquired institution's routing numbers are often preserved so existing customers don't need to update their direct deposits, autopayments, and vendor relationships. Each routing number is tied to a specific Federal Reserve processing center.

All BMO routing numbers in Illinois can be used for ACH transactions, direct deposits, and electronic payments. They are processed through the Federal Reserve and are verified using the standard ABA checksum algorithm.