One of the men, 43-year-old Bernard Ducksworth, was arrested Wednesday on rape charges.
The Marshals say that, after 6abc.com posted a photo gallery of the most wanted suspects, a reader called in a tip that Ducksworth had fled to Georgia.
Investigators say they were able to determine that Ducksworth was inside a home in the town of Jessup, where he was arrested.
Another suspect, 23-year-old Michael Bivans, is also under arrest.
Bivans was wanted for armed robbery and was arrested in Lower Moreland Township on March 14th, also thanks to a 6abc.com reader tip.
To see photos of the suspects still on the loose, see 6abc.com's "U.S. Marshals ID Most Wanted in Philly" photo gallery.
Anyone with information on any of the fugitives is asked to call the U.S. Marshal Tip Line at 1-866-865-TIPS (8477).
Tipsters are eligible for rewards, the Marshals said, at an average of $1,000.