Judge Sharon Johnson Coleman's Friday order says there is no reason to delay same-sex marriages in Illinois, when the state's law is set to take effect. Her finding applies only to Cook County.
She says no opposition has been presented to the court, and gay and lesbian couples "have already suffered from the denial of their fundamental right to marry."
The decision stems from a lawsuit filed against the Cook County clerk, who supports gay marriage. Chicago is in Cook County.
Coleman already ruled in December that same-sex couples did not have to wait until June to marry if one or both partners had a life-threatening illness. Now that applies to all couples.
Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.