It happened just before 8 p.m. Firefighters were dispatched to the 700 block of MarketView Court off Hillside Ave in the Haymount neighborhood.
When crews arrived, they saw fire coming from the first floor of a two-story apartment building.
Firefighters managed to contain the fire to one unit, but the resident was forced out of the home and is being assisted by the American Red Cross.
A person in an adjacent unit was treated by firefighters and taken by Cumberland County EMS for evaluation.
The cause of the fire remains under investigation.