The assault occurred in the vicinity of Armitage and Mozart avenues at about 9:50 a.m., police said.
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The suspect entered the woman's apartment and sexually assaulted her before he walked off northbound toward Armitage Avenue, police said.
Police released a vague description of the suspect, describing him as a Black man is in his 20s to 30s, weighing 180 to 190 lbs. who was last seen wearing a hooded green camouflage jacket with black stripes on the left sleeve as well as black shorts and black Crocs.
News of the attack spread quickly through the neighborhood.
"As a woman, it's always very scary to hear about something like that happening," resident Morgan Reed said.
"I'm just hopeful that everyone's safe who's involved and that person involved with it is doing OK and their family is taking the steps that they need," resident Michael Moore said.
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Police are asking neighbors to be aware of their surroundings as Area Five detectives continue to investigate.
Meanwhile, as police continue to investigate, a community remains on edge.
"It's scary for sure," Northwest Side resident Andie Franco. "I know that it can happen anywhere, everywhere. It's scary."
Anyone with information is asked to contact Area Five detectives at (312) 746-6554.