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How to change your name with Ameren Illinois
Married or divorced and updating your accounts? Here's how Ameren Illinois takes a name change, from its own help page.
In person or by phone only. Ameren Illinois is one of the few that won't change your name online. Call 1-800-755-5000 or visit, and bring your documents.
Ameren Illinois's steps
Ameren doesn't post online steps for a name change. Call Illinois residential customer service (weekdays 7 a.m. to 7 p.m.) and ask what they need.
Have these ready
- A copy of your marriage certificate, divorce decree or court order (most companies ask for one).
- Your updated driver's license or ID, if you have it. Social Security comes first, then the DMV.
- Your account number, and the name the account is in now.
Let Sasha handle the letters
Sasha writes and signs your name change letter for Ameren Illinois and every other company on your list, with your certificate attached. It also keeps track of who's done. The checklist is free.
Checked against Ameren Illinois's own page in October 2026. Companies change their process; confirm on their site or by phone before you send anything. Sasha isn't affiliated with Ameren Illinois.