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St Paul, Minnesota Zip Codes 55101 55102 55103 55104 55105 55106 55107 55108 55109 55110 55112 55113 55114 55115 55116 55117 55118 55119 55120 55121 55123 55124 55125 55126 55127 55128 55129 55133 55144 55145 55150 55155 55161 55164 55165 55166 55168 55169 55170 55171 55175 55177 55182 55187 55188 55190 55191 Prior to the use of zip codes, cities were divided into regions and mail was addressed as Saint Paul 10, Minnesota, 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 Saint Paul's zip code is 5 it is located in the "5" zone that includes the following areas: Iowa, Minnesota, Montana, North Dakota, South Dakota, and Wisconsin .