Weakness in 5-Digit ZIP Code Systems: Illustrative Example

Using 5-Digit ZIP-based systems, the answer to the question is:

YOU REALLY CAN’T TELL !

Place 3

Post Office

5-Digit ZIP Area

Place 1

Place 2

• 5-Digit ZIP codes cross multiple Place and county boundaries
• Multiple geocodes returned by tax compliance systems
• Manual research/selection process

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