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St Louis, Missouri Zip Codes 63101 63102 63103 63104 63105 63106 63107 63108 63109 63110 63111 63112 63113 63114 63116 63117 63118 63119 63120 63121 63122 63123 63124 63125 63126 63127 63128 63129 63131 63132 63133 63134 63135 63136 63137 63138 63139 63140 63141 63143 63144 63145 63147 63150 63151 63155 63156 63157 63158 63160 63163 63164 63166 63167 63169 63171 63178 63179 63180 63182 63188 63190 63195 63196 63197 63198 63199 Prior to the use of zip codes, cities were divided into regions and mail was addressed as Saint Louis 10, Missouri, 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 Louis's zip code is 6 it is located in the "6" zone that includes the following areas: Illinois, Kansas, Missouri, and Nebraska.