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Louisville, Kentucky Zip Codes 40201 40202 40203 40204 40205 40206 40207 40208 40209 40210 40211 40212 40213 40215 40216 40217 40218 40219 40220 40221 40222 40223 40224 40225 40228 40229 40232 40233 40241 40242 40243 40245 40250 40251 40252 40253 40255 40256 40257 40259 40261 40266 40268 40269 40270 40272 40280 40281 40282 40283 40285 40287 40290 40291 40292 40293 40294 40295 40296 40297 40298 40299 Prior to the use of zip codes, cities were divided into regions and mail was addressed as Louisville 10, Kentucky, 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 Louisville's zip code is 4 it is located in the "4" zone that includes the following areas: Indiana, Kentucky, Michigan, and Ohio.