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Mailing Addresses for your Ameren 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   Ameren Missouri Mailing Addresses
For residential payments:   For residential payments:
  Ameren Illinois     Ameren Missouri
  P.O. Box 66884     P.O. Box 66529
  St. Louis, MO 63166-6884     St. Louis, MO 63166-6529
         
For business payments:   For business payments:
  Ameren Illinois     Ameren Missouri
  P.O. Box 66893     P.O. Box 66301
  St. Louis, MO 63166-6893     St. Louis, MO 63166-6301
         
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