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Ameren Illinois Customer Service: Ameren Missouri Customer Service:
Residential Customers Phone: 800.755.5000 Residential Customers Phone: 800.552.7583
  7:00 a.m. - 7:00 p.m./M-F Fax: 800.851.1796   7:00 a.m. - 7:00 p.m./M-F Fax: 866.297.8054
                 
Business Customers Phone: 800.232.2477 Business Customers Phone: 800.552.7583
  7:00 a.m. - 7:00 p.m./M-F Fax: 877.263.7369   7:00 a.m. - 5:30 p.m./M-F Fax: 866.222.3471
                  
 
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