Cortney Marie Markiewicz, 17, was found in Baltimore City, police said.
Earlier, police asked for help finding Markiewicz, who made some phone calls and ran away from GBMC after 10 p.m. on Friday, May 16, according to officials, who later reported she may have been in Virginia.
On Friday morning, Baltimore County police reported that Markiewicz was returned home safely from Baltimore City with the assistance of the Maryland State Police Child Apprehension Unit.
The department thanked citizens for assisting police in the search.
Related: 17-Year-Old Missing from GBMC