Keyword Analysis & Research: united states postal zip codes map

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Frequently Asked Questions

What are US Postal ZIP codes?

ZIP Codes are numbered with its first digit denoting a certain group of U.S. states, the second and third digits together representing a region in that particular group (or maybe a large city) and the fourth and fifth digits denoting a group of delivery addresses that are within that region.

How many ZIP codes are there in the United States of America?

Currently there are 42,000 zip codes in the United States.

What is the lowest ZIP code in the United States?

The lowest in-use zip code is 00501 and it belongs to the IRS mail processing center located in Holtsville, New York. Conversely, the highest in-use zip code, 99950, belongs to the city of Ketchikan, Alaska.

What is the largest ZIP code in the US?

Chicago, Illinois ZIP Code 60629 has the largest population out of any US ZIP Code, with just over 114,000 people residing within its boundaries.

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