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Baltimore, Maryland Zip Codes 21075 21201 21202 21203 21204 21205 21206 21207 21208 21209 21210 21211 21212 21214 21215 21216 21217 21218 21219 21220 21221 21222 21223 21224 21225 21226 21228 21229 21230 21231 21233 21234 21235 21236 21237 21239 21240 21241 21244 21251 21252 21263 21264 21265 21268 21270 21273 21274 21275 21278 21279 21280 21282 21283 21284 21285 21286 21287 21288 21289 21290 21297 21298 Prior to the use of zip codes, cities were divided into regions and mail was addressed as Baltimore 10, Maryland, 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 Baltimore's zip code is 2 it is located in the "2" zone that includes the following areas: District of Columbia, Maryland, North Carolina, South Carolina, Virginia, and West Virginia.