State tax filing

@finch13 
No, do not make up the address.  I'll tell you 2 ways to contact the Illinois DOR to ask them for the physical  street address that they they use for private delivery services such as UPS.

If you can phone from your country, you will find a contact phone number at the Illinois DOR website.   You may not be able to use 800 numbers, but it also shows a 217 number.

https://www2.illinois.gov/rev/aboutidor/Pages/contactus.aspx

Since you may not be able to phone them,  I'll tell you how you can submit a question in a webform to the Illinois DOR asking for an exact street address that they they use for private delivery services such as UPS.   

This link is for the "questions and comment form" at the Illinois Dept. of Revenue.  Fill it out, and they should email you a response.  You may wish to tell them if you have a payment or not, in case it makes a difference.

https://www2.illinois.gov/rev/Pages/Questions.aspx?Topic=22

See the image attached below.  Click it to enlarge.