Pay by Mail 
 
 
Include your bill stub with your check or money order to ensure that your account is credited with your payment. Allow at least five days for the payment to reach us.

Residential Customers

Ameren Illinois
P.O. Box 66884
St. Louis, MO 63166-6884         
           Business Customers

Ameren Illinois
P.O. Box 66893
St. Louis, MO 63166-6893
payment addresses, mailing address, addresses, where to mail my payment, Ameren Illinois
 
 
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