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METROPOLITAN AREA 
PHILADELPHIA 
ROE MCTROROLTAN AREA oor 
POPULATION LIMITS T——— 
COMMUTING AREA — —— 
SUSURBAN, EWEPMPER. CIRCULATION mm me 
METROPOLITAN TELEPHONE, SERUCE sreevseneerss 
PHESI uses process ASSCCTON 
Master Map used in final determination of Metropolitan Area. On this map 
were drawn the boundary lines expressing the extent of influence of the vari- 
ous determinant factors, such as population density limits, commuting area, 
etc. The true Metropolitan Area line was developed as a composite of all 
these. Then, since township divisions are the smallest within which public 
and other agencies customarily compile statistical information, the true 
Metropolitan Area line (shown as light solid line on this map) was adjusted 
to conform to nearest existing township lines, the final Metropolitan Area 
line (heavy solid line) expressing this adjustment. 
Five