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Denver, Colorado Zip Codes 80002 80010 80012 80014 80022 80030 80031 80033 80123 80127 80201 80202 80203 80204 80205 80206 80207 80209 80210 80211 80212 80214 80215 80216 80217 80218 80219 80220 80221 80222 80223 80224 80225 80226 80228 80229 80230 80231 80232 80233 80234 80235 80236 80237 80238 80239 80241 80243 80244 80246 80247 80249 80250 80251 80252 80254 80255 80256 80257 80259 80260 80261 80262 80263 80264 80265 80266 80270 80273 80274 80275 80279 80280 80281 80285 80290 80291 80292 80293 80294 80295 80299 Prior to the use of zip codes, cities were divided into regions and mail was addressed as Denver 10, Colorado, 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 Denver's zip code is 8 it is located in the "8" zone that includes the following areas: Arizona, Colorado, Idaho, New Mexico, Nevada, Utah, and Wyoming.