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 |
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Business Customers
Ameren Illinois
P.O. Box 66893
St. Louis, MO 63166-6893 |
