How do I find the routing number for my BMO HARRIS BANK,N.A. account?

To find your BMO HARRIS BANK,N.A. routing number on BankZop: (1) Select your state above, (2) Choose your city, (3) Select your specific routing number from the list. The result page displays the 9-digit ABA routing number with a one-click Copy button. Alternatively, the routing number is printed at the bottom-left of any BMO HARRIS BANK,N.A. personal check, available in the Account Details section of your BMO HARRIS BANK,N.A. online banking, or on your BMO HARRIS BANK,N.A. monthly account statement.

Does BMO HARRIS BANK,N.A. have different routing numbers for ACH and wire transfers?

Many large US banks use a different routing number for domestic wire transfers than the one used for ACH payments and direct deposits. If you are initiating a wire transfer from or to a BMO HARRIS BANK,N.A. account, always confirm the correct wire routing number directly with BMO HARRIS BANK,N.A.'s wire department — do not assume the ACH routing number is valid for wires. The BankZop result page displays the known ABA routing numbers for BMO HARRIS BANK,N.A., but always call your branch to confirm for high-value wire transfers.

Why does BMO HARRIS BANK,N.A. have multiple routing numbers?

Large US banks like BMO HARRIS BANK,N.A. often have multiple ABA routing numbers — typically one per state or region. This is because the routing number system was originally designed for a geographically segmented banking network where each bank operated primarily within a single Federal Reserve district. When banks expanded nationally, they retained separate routing numbers per state. The correct routing number for your BMO HARRIS BANK,N.A. account depends on the state where your account was originally opened — not necessarily where you live today.

What happens if I use the wrong BMO HARRIS BANK,N.A. routing number?

Using the wrong routing number on an ACH transfer or direct deposit will cause the transaction to be rejected and returned — typically within 1–3 business days. The funds are returned to the originating account. For wire transfers, a wrong routing number may delay settlement or route the wire to an incorrect institution, requiring a recall process. Always verify the correct BMO HARRIS BANK,N.A. routing number for your specific state using BankZop before submitting any payment or setting up direct deposit.

Where is the BMO HARRIS BANK,N.A. routing number printed on a check?

The BMO HARRIS BANK,N.A. routing number is printed at the bottom-left of every personal check in the MICR line — the band of magnetic ink characters at the very bottom of the check. It is always the first 9-digit sequence, surrounded by transit symbols that look like colons. The account number appears in the center of the MICR line, and the check number appears on the right. Do not confuse the routing number (9 digits, always first) with the account number (varies in length, appears second).

Is the BMO HARRIS BANK,N.A. routing number the same for all accounts?

Not always. BMO HARRIS BANK,N.A. may use different routing numbers for accounts opened in different states. Two customers of BMO HARRIS BANK,N.A. — one in California and one in New York — may have different routing numbers even though they bank with the same institution. The routing number assigned to your account depends on the state where it was opened. Use BankZop to select your state and find the correct BMO HARRIS BANK,N.A. routing number for your account.

Can I use the BMO HARRIS BANK,N.A. routing number for international transfers?

No. ABA routing numbers like BMO HARRIS BANK,N.A.'s only work within the US domestic payment system (ACH, Fedwire). For international wire transfers to or from a BMO HARRIS BANK,N.A. account, you need the bank's SWIFT/BIC code — not the 9-digit routing number. Visit BankZop's SWIFT Code Lookup to find the correct SWIFT code for international transfers. Your receiving bank abroad will also typically require your full account number and BMO HARRIS BANK,N.A.'s SWIFT code.

BMO HARRIS BANK,N.A. Routing Numbers — All States

Q: What is the routing number for BMO HARRIS BANK,N.A.?

BMO HARRIS BANK,N.A. has 64 routing numbers across 1 state. Large US banks like BMO HARRIS BANK,N.A. typically maintain different routing numbers for different states. Each 9-digit ABA routing number is assigned by the American Bankers Association (ABA) and is used for ACH transfers, direct deposits, wire transfers, and check payments. Select your state above to find the correct routing number for your location.

BMO HARRIS BANK,N.A. Routing Numbers — Complete State Directory

BMO HARRIS BANK,N.A. is registered with the American Bankers Association (ABA) and participates in the US ACH and Fedwire payment networks across 1 states. Every ABA routing number is a unique 9-digit code that identifies BMO HARRIS BANK,N.A. (or a specific state office of BMO HARRIS BANK,N.A.) within the Federal Reserve's payment infrastructure. BankZop's BMO HARRIS BANK,N.A. routing number directory covers all 64 active routing records, sourced from the official ABA routing registry and the Federal Reserve E-Payments Routing Directory.

You need the correct BMO HARRIS BANK,N.A. routing number whenever you set up direct deposit for payroll, register your account for ACH bill payments, provide banking details for tax refunds, or initiate a domestic wire transfer. Selecting the wrong routing number — particularly for a different state — can result in rejected transactions or delayed payments.

What is the Routing Number for BMO HARRIS BANK,N.A.?

BMO HARRIS BANK,N.A. has 64 routing numbers registered across 1 states. Unlike smaller community banks that operate with a single routing number nationwide, large institutions like BMO HARRIS BANK,N.A. maintain state-specific routing numbers — a legacy of the regional banking structure established when the ABA routing system was created in 1910. Your BMO HARRIS BANK,N.A. routing number is determined by the state where your account was originally opened, not your current address.

The 9-digit ABA routing number encodes three components: the Federal Reserve district (digits 1–4), the ABA institution identifier (digits 5–8), and a mathematical check digit (digit 9) that allows computers to instantly detect entry errors. Select your state above to find the exact routing number for BMO HARRIS BANK,N.A. in your state.

How to Find Your BMO HARRIS BANK,N.A. Routing Number

BankZop provides the fastest way to find the correct BMO HARRIS BANK,N.A. routing number for your state. Use the drill-down above:

Step 1 — Select State: Choose the state where your BMO HARRIS BANK,N.A. account was opened from the list above. Use the filter box to find your state instantly.
Step 2 — Select City: After selecting your state, choose the city associated with your BMO HARRIS BANK,N.A. routing number.
Step 3 — Select Number: Pick the specific routing number from the list for that city.
Step 4 — View Result: The result page displays the full 9-digit routing number with a one-click Copy button, along with the bank name, address, city, state, ZIP, and phone number.

Alternatively, your BMO HARRIS BANK,N.A. routing number is printed at the bottom-left of any personal check in the MICR line — it is always the first 9-digit sequence. You can also find it in your BMO HARRIS BANK,N.A. online banking under Account Details, on your monthly statement, or by calling BMO HARRIS BANK,N.A.'s customer service number printed on the back of your debit card.

When You Need the BMO HARRIS BANK,N.A. Routing Number

Direct Deposit Setup

When setting up payroll direct deposit, IRS tax refunds, Social Security benefits, or any other recurring payment to your BMO HARRIS BANK,N.A. account, you must provide your routing number alongside your account number. Your employer or the paying agency uses these details to initiate an ACH credit that deposits funds directly into your account on the scheduled date. Use the correct state-specific BMO HARRIS BANK,N.A. routing number — the one assigned to the state where your account was opened.

ACH Transfers and Bill Payments

ACH is the backbone of US electronic payments — used for online bill payments, subscription services, peer-to-peer transfers, and business payroll. When you authorise a company to debit your BMO HARRIS BANK,N.A. account electronically, you provide the BMO HARRIS BANK,N.A. routing number and your account number. The ACH network, governed by NACHA, uses the routing number to direct the debit or credit to the correct financial institution. Standard ACH settles in 1–2 business days; Same Day ACH settles same-day for transactions submitted before the cut-off.

Domestic Wire Transfers

Domestic wire transfers move funds in real time through the Federal Reserve's Fedwire system and settle on the same business day. Important: BMO HARRIS BANK,N.A. may use a different routing number for wire transfers than for ACH. Always confirm the correct wire routing number with BMO HARRIS BANK,N.A.'s wire department before initiating a wire — using the ACH routing number for a wire transfer may cause it to be rejected or delayed. For international wire transfers, you need the BMO HARRIS BANK,N.A. SWIFT/BIC code instead of the routing number.

Check Payments

The routing number printed on your BMO HARRIS BANK,N.A. checks is the same as your ACH routing number. When you write a check, the routing number in the MICR line at the bottom allows the Federal Reserve's check clearing system to identify BMO HARRIS BANK,N.A. as the paying bank and route the check back for settlement. Paper check processing has declined significantly with ACH adoption, but routing numbers remain essential for check payment infrastructure.

BMO HARRIS BANK,N.A. Routing Number vs Account Number — Key Differences

These two numbers are always required together for any ACH or wire transaction. They are easy to confuse — here is exactly how they differ:

Feature	BMO HARRIS BANK,N.A. Routing Number	BMO HARRIS BANK,N.A. Account Number
Identifies	BMO HARRIS BANK,N.A. as the institution	Your specific account at BMO HARRIS BANK,N.A.
Length	Always 9 digits	Varies (typically 10–12 digits)
On a Check	Bottom-left, first sequence	Bottom-center, second sequence
Shared?	Same for all accounts in your state	Unique to your individual account

Never share your account number more than necessary — it gives access to your specific account. Your routing number is public information (all BMO HARRIS BANK,N.A. customers in your state share it), but your account number must be protected. For international transfers, neither the routing number nor account number is sufficient alone — you also need the BMO HARRIS BANK,N.A. SWIFT code.

BMO HARRIS BANK,N.A. Routing Numbers by State

BMO HARRIS BANK,N.A. operates across 1 US states with 64 routing numbers registered in the ABA directory. Click any state below to browse routing numbers directly:

IL 64

Routing number counts reflect active ABA records as of Jun 2026. Data sourced from the Federal Reserve E-Payments Routing Directory.

To find routing numbers for other banks, visit the Routing Number Lookup homepage. For international wire transfers, use the SWIFT Code Lookup. For Indian bank transfers, use the IFSC Code Lookup. To calculate loan repayments, try the free EMI Calculator.