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You don't notify the Secretary of State of an address change. Contact your DMV and the post office.
Whenever you change your legal address or normal place of abode.
You can change your address with the DMV ;online or in person with a piece of mail with the correct address on it.
Notify the USCIS office. Sent a written notice of address change (Form AR-11).
In the past I've used Returnpath.com
USPS.com or at your local post office branch.
When you submit a change of address to the USPS they forward your mail to your new address for 12 months, but do not notify any senders of the change. From 12 months to 18 months they will not forward your mail, but will return the mail to the sender with your new address on it.
If a change of address postcard to notify the postal service that the address is changing, the postcard does not need to be purchased. It can be obtained by going to the local post office, and asking for one. Fill it out, and mail it back.
Notify them at their agency home office, which presumably is in Albany. Better yet, call them and ask.
After you move to IL, apply at the DMV for an IL license? They will issue you an IL license (if you are eligible). You must surrender your IN license and they will notify IN to cancel it. You are not allowed (federal law) to possess a drivers license from more than one state (your 'home' state).
You should notify customers about a change in the billing date as soon as possible. The earlier you notify a customer, the easier they will be able to adjust.
I believe you have 30 days, as in most states. Of course, it doesn't hurt to let them know immediately.