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Mailing Addresses for Ameren Illinois 
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.
Mail all payments to the address on your bill or:
Ameren Illinois
PO Box 88034
Chicago, IL 60680-1034
Allow at least five days for your payment to reach us.
Send correspondence to:
Ameren Illinois
300 Liberty St.
Peoria, IL 61602
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