Contact us

Member Contact Center

800-328-1935 (24/7)
TDD/TTY: 773-462-2300
International Calls: 773-462-2000

Self Service Telephone (SST)

773-462-2100 or 800-482-5328
24-hour account access, 7-days-a-week


For account-specific questions, please login to Alliant Online Banking and use secure e-mail or contact us at 800 328-1935 (24/7).

For all general inquiries, please send us an email.

Mailing Address

Alliant Credit Union
P.O. Box 66945
Chicago, IL 60666-0945

Overnight Service

For overnight service, the preferred method for mailing to Alliant Credit Union is Federal Express or UPS.

Alliant Credit Union
11545 W. Touhy Avenue
Chicago, IL 60666

ATM/Check Card

Lost/Stolen Card 800-328-1935 or 773-462-2000
Mon - Fri, 7am-7pm CT
After 7pm or weekends 866-861-5411
Falcon, Fraud for ATM/Debit Cards 866-395-3394

VISA® Credit Cards

Account Information 866-444-8529
Lost/Stolen Cards 866-444-8529
VISA Benefit Questions 800-VISA-911
24-hour account access, 7-days-a-week

VISA® Credit Card Payments

(Via US Mail)
P.O. Box 1666
Des Plaines, IL 60017-1666

(Via Fed Ex)
Alliant Credit Union
Attn: VISA Operations
11545 W. Touhy Ave
Chicago, IL 60666

Send Written Disputes to:
Alliant Credit Union
Attn: Cards Risk Management Team
P.O. Box 10409
Des Moines, IA 50306

VISA® Gift Cards

To Purchase Gift Cards 800-328-1935
Gift Card Support 866-466-2362

First Mortgages

800-328-1935 Option 5
Mon - Fri, 8am-5:30pm CT

In Case of Errors or Questions About Your Mortgage Statement
You have certain rights under Federal law related to resolving errors and requesting information about the servicing of your mortgage. You may learn more about your rights by contacting us in writing at the address below. If you would like more information about your mortgage or copies of certain documents relating to your mortgage, or if you believe that your mortgage statement contains an error, please send your name, mortgage account number, and a detailed written description of the suspected error or the information you are requesting in writing to the address below. We will acknowledge receipt of your request with five business days of receiving it, and provide you with a full response or resolution within 30 business days of receipt.

Mail requests to:
Alliant Credit Union
Attn: Mail Department MS-NOE
P.O. Box 66945
Chicago, IL 60666-0945

P.O. Box- Deposits/Payments

Alliant Credit Union
P.O. Box 2387
Des Plaines, IL 60017-2387

If you have old deposit tickets, loan coupons or mailing labels that indicate an address other than the address listed above, please do not use them. Save time and money... deposit your checks online.

Note: If your mortgage loan coupon shows a different P.O. Box, you must send your payment to that P.O. Box as indicated on the loan coupon.

Note: FedEx and other similar services do not deliver to P.O. Boxes. If you are sending deposits/payments other than by the U.S. Postal Service, you must address them to Alliant Credit Union, 11545 West Touhy Ave., Chicago, IL 60666, 800-328-1935.

Alliant ABA Routing and Transit Number

# 271081528
To arrange Electronic Funds Transfer, supply financial institution or billing company with Credit Union ABA Routing and Transit Number, type of account and your Alliant Credit Union Member Number.

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VISA® Cards
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Gift Card
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Lost or Stolen Card
Credit Card

ATM/Check Card