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Seattle, Washington Zip Codes
98101
98102
98103
98104
98105
98106
98107
98108
98109
98110
98111
98114
98115
98116
98117
98118
98119
98121
98122
98124
98125
98126
98131
98132
98133
98134
98136
98138
98144
98145
98146
98148
98151
98155
98158
98160
98161
98164
98166
98168
98170
98171
98174
98177
98181
98184
98185
98188
98190
98191
98195
98198
98199
Prior to the use of zip codes, cities were divided into regions and mail was addressed as Seattle 10, Washington, for example, to show which region of the city the mail was intended for. As cities continued to grow this system was not sufficient and was replaced by the Zip Code. ZipCodes went into effect in 1963. The United States Postal Service (USPS) initially used a cartoon character Mr. Zip to promote the use of zip codes. In 1983 the zipcode added the last four digits in an attempt to more narrowly define an address.

The first three digits of a zip code indicate the sectional center facility which will ultimately sort and distribute that piece of mail. All mail to that 5 digit zipcode will first arrive at the sectional center facility then after sorting continue along to its exact destination.

Since the first digit of Seattle's zip code is 9 it is located in the "9" zone that includes the following areas: Alaska, American Samoa, California, Guam, Hawaii, Marshall Islands, Federated States of Micronesia, Northern Mariana Islands, Oregon, Palau, Washington, Army Post Office Pacific, and Fleet Post Office Pacific .