MB Financial Bank Routing Number: Chicago Banking Guide

What is the MB Financial Bank routing number?

MB Financial Bank used routing number 071001737 for ACH transactions, direct deposits, and electronic payments. MB Financial was a prominent Chicago-based commercial bank before being acquired by Fifth Third Bank in 2019.

MB Financial Bank was known for its strong commercial and middle-market banking presence in the Chicago metropolitan area. Following the acquisition, MB Financial accounts were transitioned to Fifth Third Bank, and account holders may have been assigned new routing numbers.

MB Financial Bank transition to Fifth Third

Fifth Third Bancorp completed its acquisition of MB Financial in March 2019 in a deal valued at approximately $4.7 billion. MB Financial customers were migrated to Fifth Third Bank systems during the integration process.

If you previously held an MB Financial Bank account, your routing number may have changed to a Fifth Third Bank routing number. Verify the current routing number on your account through online banking or by contacting Fifth Third customer service.

Finding your current routing number

Former MB Financial Bank customers should check their current Fifth Third Bank account for the updated routing number. Fifth Third uses different routing numbers depending on the state where the account was opened.

You can find your current routing number on the bottom-left of your Fifth Third Bank checks, in online banking, or through the Fifth Third mobile app. Customer service at 1-800-972-3030 can also help confirm your routing number.

Direct deposit and wire transfers

If you are setting up new direct deposits or wire transfers for a former MB Financial account, use the Fifth Third Bank routing number now assigned to your account. Using the old MB Financial routing number 071001737 may result in transaction delays or rejections.

Fifth Third Bank supports both domestic and international wire transfers, ACH payments, and direct deposits across its full branch network. Refer to the Fifth Third routing number page for your state-specific routing number.

Business banking with Slash

MB Financial Bank was valued for its commercial banking expertise in Chicago. For businesses seeking modern digital financial tools alongside traditional banking, Slash offers unlimited virtual cards, automated expense management, and real-time cash flow dashboards.

Slash provides integrated ACH and wire transfer capabilities, multi-user access controls, and native accounting integrations that complement any banking relationship for growing companies.