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Milwaukee, Wisconsin Zip Codes 53201 53202 53203 53204 53205 53206 53207 53208 53209 53211 53212 53213 53214 53215 53216 53217 53218 53219 53221 53222 53223 53224 53225 53226 53227 53228 53233 53235 53237 53259 53263 53267 53268 53270 53274 53277 53280 53281 53284 53285 53288 53290 53293 53295 Prior to the use of zip codes, cities were divided into regions and mail was addressed as Milwaukee 10, Wisconsin, 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 Milwaukee'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 .