: A five-digit system. Codes starting with "1" are assigned to Delaware, New York, and Pennsylvania. For example, the 157xx prefix is dedicated to regions in Western Pennsylvania. Scientific and Technical Context
: A six-digit system where the first digit represents a region. For example, codes starting with "1" represent Northern India (Delhi, Haryana, Punjab). A similar-looking code like 110015 belongs to the L.M. Nagar Industrial Area in West Delhi. 157300 zip
To understand why "157300" might be confused with a postal code, it is helpful to look at the systems it resembles: : A five-digit system