Great Lakes Credit Union Routing Number: Illinois Banking Guide

What is the Great Lakes Credit Union routing number?

Great Lakes Credit Union uses routing number 271078146 for all ACH and electronic transactions. Headquartered in Bannockburn, Illinois, Great Lakes CU serves members across the northern Illinois and Lake County region with a full range of personal and business banking services.

Founded in 1938, Great Lakes Credit Union has grown into one of the largest community credit unions in the Chicago metropolitan area. The credit union is committed to providing affordable financial solutions with low fees, competitive loan rates, and accessible member services.

How to find your Great Lakes CU routing number

Routing number 271078146 is printed on the bottom-left of your Great Lakes Credit Union checks, before your account number and check number. You can also find it by logging into online banking and viewing your account details.

The Great Lakes CU mobile app shows your routing and account numbers in the account information section. Branch staff at any Great Lakes Credit Union location can verify your routing number and help you set up transfers.

Great Lakes CU direct deposit and ACH

Set up direct deposit at Great Lakes Credit Union by providing routing number 271078146 and your account number to your employer. The credit union processes payroll and government benefit deposits on standard ACH timelines with funds available on your scheduled pay date.

Great Lakes CU supports full ACH capabilities including direct deposits, bill payments, and external account transfers. Online banking lets you automate recurring payments and manage all electronic transfer preferences from your computer or mobile device.

Great Lakes CU wire transfers

Great Lakes Credit Union facilitates domestic wire transfers using routing number 271078146. Wires can be initiated by visiting a branch or contacting member services. Incoming domestic wires are typically credited the same business day when received before the cutoff time.

International wire transfers are also available through Great Lakes CU for cross-border payments. Contact the credit union for current wire transfer fees, exchange rates, and documentation required for international transactions.

Business banking with Slash

Great Lakes Credit Union serves northern Illinois members with community-focused banking. For businesses that need modern digital banking tools, Slash offers instant ACH and wire transfers, unlimited virtual cards, automated expense management, and real-time cash flow visibility — all accessible from anywhere.

Slash is built for businesses that want to move beyond branch-based banking with multi-entity support, team spending controls, up to 2% cashback on card spend, and seamless integrations with accounting platforms like QuickBooks and Xero.