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Cincinnati, Ohio Zip Codes 45201 45202 45203 45204 45205 45206 45207 45208 45209 45210 45211 45212 45213 45214 45216 45217 45218 45219 45220 45221 45222 45223 45224 45225 45226 45227 45228 45229 45231 45232 45233 45234 45235 45236 45237 45238 45239 45240 45241 45242 45243 45244 45246 45247 45248 45249 45250 45251 45252 45253 45254 45255 45258 45262 45263 45264 45268 45269 45270 45271 45273 45274 45275 45277 45280 45296 45298 45299 45944 45999 Prior to the use of zip codes, cities were divided into regions and mail was addressed as Cincinnati 10, Ohio, 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 Cincinnati's zip code is 4 it is located in the "4" zone that includes the following areas: Indiana, Kentucky, Michigan, and Ohio.