ZIP 4 Code lookup, get last 4 digits of 9-digit ZIP Code

4 Digit Zip Code Extension

A zip code is any 5-digit number, where each digit is an integer from 0 to 9. For example, 92122 and 00877 are both zip codes. How many zip codes have exactly 3 different digits? For example, 91000, 33118, 41440, and 42020. (You may use a calculator. Give the exact number. No justification necessary.)

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Your ZIP Code Might Determine How Long You Live—and the Difference Could Be Decades

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