City Hall rooms are numbered sequentially from 0 to 99 in a clockwise direction. Starting and ending at the tower and prefixed by the floor number, odd numbered rooms are on the courtyard side of the corridor and even numbers are opposite on the building's perimeter. With four symetrical sides, and four quadrents, it relativly easy to get a general idea where a particular room is - ie. Room #554 is most likely on the 5th floor of the building on the south side facing the street.
Entrances and elevators are located at each corner of the building. There are also handicapped accessable entrances at the East, South, and West Portals.

Over 50% of City Hall's space belongs to the First Judicial Court of Common Pleas.
Much of this space is currently unused as the trial division of Common Pleas court moved into a new Criminal Justice Center across the street in December 1996. It is expected that the vacant courtrooms in City Hall will eventually be utilized by civil courts currently housed in several different buildings around the city.

Office space in City Hall has historically been somewhat dynamic, as departments move in and out. The building was originally designed for the executive, leglislative, and judicial branches of Philadelphia City government, but spaces within the building also house other city services. This directory is the most current available and should be relativly accurate.