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The first step to filing for divorce is to establish grounds. In Illinois, either spouse can seek a no-fault divorce once the spouses have lived separate and apart for 2 years. If that's not the case, then you have to be able to establish: bigamy, adultery, abuse, alcohol abuse or drug addiction lasting at least 2 years, or abandonment for at least one year.
Once you have grounds, you can file a Petition for Dissolution of Marriage. Some counties may have forms you can use online. For example, here are the forms and instructions for Cook County. The process for filing an uncontested divorce does tend to be simpler. This site also has forms that may be useful.
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