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San Diego, California Zip Codes 92101 92102 92103 92104 92105 92106 92107 92108 92109 92110 92111 92112 92113 92114 92115 92116 92118 92119 92120 92121 92122 92123 92124 92126 92127 92128 92129 92130 92131 92132 92133 92134 92136 92137 92138 92139 92140 92142 92143 92145 92147 92149 92150 92152 92153 92154 92155 92158 92160 92161 92162 92163 92164 92165 92166 92167 92168 92169 92170 92171 92172 92173 92174 92175 92177 92178 92179 92182 92184 92186 92187 92190 92191 92192 92193 92194 92195 92196 92197 92198 92199 Prior to the use of zip codes, cities were divided into regions and mail was addressed as San Diego 10, California, 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 San Diego'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 .