Public records for states are located in the states capital city and Illinois's state capital is Springfield and the department of public health is also located in Springfield and it is where the public records are kept in archives and databases. People can view public records by doing either one of two things.
The first thing you can do is to go onto Google and search for "Illinois Birth Records" and when the listings appear you should click on the first listing which will take you onto the vital statistics page for the department of public health and you should then proceed to find the mailing address for the department. Then you need to write a request form and send it to the address that is listed on the website and you must include why you wish to be granted access to the archives and view the records.
However this process is very very time consuming an laborious because once you send off your request form there is nothing you can do influence the speed at which it takes to evaluate your application. The time it takes for your form to be evaluated and sent back to you with permission may takes weeks if not months, and there have been cases where people have been granted permission and they have tralleved to the town hall where the archives are kept and located the specific records they were looking for and found that the records were either not there or very outdated and inaccurate.
Although this may seem like the only option to obtain public records, it is not as there are professional record services out there such as Online Sleuths that have a massive archive and online database, which can easily accessible online which means you don't have to leave the comfort of your own home and travel many miles. To be able to have access to many thousands of emails all you have to do is become a member of the service by inputting the necessary information to join and also pay a small fee of around $20-$40. Once you have become a member you then have access to thousands of public records, which are 100% legal and confidential.
If you want access for Illinois Birth Records then I would highly recommend using Online Sleuths as they have one of the largest databases full of public records