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Houston, Texas Zip Codes 77001 77002 77003 77004 77005 77006 77007 77008 77009 77010 77011 77012 77013 77014 77015 77016 77017 77018 77019 77020 77021 77022 77023 77024 77025 77026 77027 77028 77029 77030 77031 77032 77033 77034 77035 77036 77038 77039 77040 77041 77042 77043 77044 77045 77046 77047 77048 77049 77050 77051 77052 77053 77054 77055 77056 77057 77058 77059 77060 77061 77062 77063 77064 77065 77066 77067 77068 77069 77070 77071 77072 77073 77075 77076 77077 77078 77079 77080 77081 77082 77083 77084 77085 77086 77087 77088 77089 77090 77091 77092 77093 77094 77095 77096 77097 77098 77099 77201 77202 77203 77204 77205 77206 77207 77208 77209 77210 77212 77215 77216 77217 77218 77219 77220 77221 77222 77223 77224 77225 77226 77227 77228 77229 77230 77231 77233 77234 77235 77236 77237 77238 77240 77241 77242 77243 77244 77245 77248 77249 77251 77252 77253 77254 77255 77257 77258 77259 77261 77262 77263 77265 77266 77267 77268 77269 77270 77271 77272 77273 77274 77275 77277 77279 77280 77281 77282 77284 77287 77288 77289 77290 77291 77292 77293 77297 77298 77299 Prior to the use of zip codes, cities were divided into regions and mail was addressed as Houston 10, Texas, 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 Houston's zip code is 7 it is located in the "7" zone that includes the following areas: Arkansas, Louisiana, Oklahoma, and Texas.