The one-alarm blaze was reported at 2:06 a.m. at a house at 1729 23rd Ave. and was under control by 3:15 a.m., fire Battalion Chief Melinda Drayton said.
A firefighter suffered minor injuries and was treated at the scene and released, Drayton said.
About eight people were displaced and the fire caused an estimated $200,000 in damage.
Drayton said the home's smoke detectors alerted the residents to the fire and they were able to evacuate quickly.
Fire investigators were still on the scene at 5 a.m. but a preliminary investigation indicated it was an electrical fire, Drayton said.