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San Francisco, California Zip Codes 94101 94102 94103 94104 94105 94106 94107 94108 94109 94110 94111 94112 94114 94115 94117 94118 94119 94120 94121 94122 94123 94124 94125 94126 94127 94128 94129 94130 94132 94133 94134 94135 94136 94137 94138 94139 94140 94141 94142 94143 94144 94145 94147 94150 94151 94152 94153 94154 94155 94156 94157 94159 94160 94161 94162 94163 94165 94166 94167 94168 94169 94170 94171 94172 94175 94177 94188 Prior to the use of zip codes, cities were divided into regions and mail was addressed as San Francisco 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 Francisco'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 .