----------------------------Original message---------------------------- This may be old stuff to long timers on maps-l. But...here goes, has anyone produced software for 5-digit zip code areas? Our information is that local zip code area are under the control of local postmasters, mistresses (!) and that, for example, if a new suburb goes in to a particular region, the two or three postmasters involved will negotiate the boundary to realign coverage. This could therefore happen on an annual basis, or literally anytime, anywhere, and may explain the overall difficulty of 5digit zip code mapping on any consistent basis anywhere! Can't remember the source of this info, but suspect it was a reader... Thanks for any help out there, Alice [log in to unmask]