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Mailing Addresses for your Payment 
Please 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.
Ameren Illinois Mailing Addresses    
For residential payments:   For business payments:
  Ameren Illinois     Ameren Illinois
  P.O. Box 66884     P.O. Box 66893
  St. Louis, MO 63166-6884     St. Louis, MO 63166-6893
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