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Portland, Oregon Zip Codes 97201 97202 97203 97204 97205 97206 97207 97208 97209 97210 97211 97212 97214 97215 97216 97217 97218 97219 97220 97221 97222 97223 97224 97225 97228 97229 97230 97231 97232 97233 97236 97238 97239 97240 97242 97251 97254 97255 97256 97258 97259 97266 97267 97268 97269 97271 97272 97280 97282 97283 97286 97290 97291 97292 97293 97294 97296 97298 97299 Prior to the use of zip codes, cities were divided into regions and mail was addressed as Portland 10, Oregon, 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 Portland'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 .