STARSHIP CLASS
Philadelphia-class
Affiliation:	Federation Starfleet
Type:	survey ship
Service period:	23rd century

The Philadelphia-class was a type of survey ship starship which was in service to the Federation Starfleet in the 23rd century. This class was named for the city of Philadelphia on Earth.

In 2269, the USS Billy Bishop, a Philadelphia-class vessel, was assigned to patrol the border of the Klingon Neutral Zone. (TOS video game: Judgment Rites)

Presumably, there would have been a USS Philadelphia prototype after which this class would have been named, a predecessor in the name to the later starships USS Philadelphia.

Starship classes of the United Federation of Planets
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By type	Federation cargo ship • Federation colony ship • Federation construction ship • Federation galaxy ship • Federation light cruiser (Intrepid-variant) • Federation mining freighter • Federation repair ship