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Mailing Addresses for Ameren Payments 
Please include your bill stub with your check or money order. If you do not have your bill stub, write your 10-digit account number or service address on your payment to ensure your account is credited. Allow at least five days for the payment to reach us.
Ameren Illinois Mailing Addresses Ameren Missouri Mailing Addresses
Send all payments to: Send all payments to:
Ameren Illinois Ameren Missouri
PO Box 88034 PO Box 88068
Chicago, IL 60680-1034 Chicago, IL 60680-1068
Send correspondence to: Send correspondence to:
Ameren Illinois Ameren Missouri
300 Liberty St. PO Box 790352
Peoria, IL 61602 St. Louis, MO 63179-0352
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