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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.