All Zip Codes in Benicia CA Zip Codes Com Form

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between 1940 and 1960 the amount of mail doubled in the United States that's largely because companies begin using computers to send automated mailings soon the flood of mails sent by banks advertisers and other businesses was overwhelming postal workers the Postal Service needed a solution in 1963 the zone improvement plan divided the country into ten regions and assigned five digits increasing in specificity from region two large sorting centers to smaller post offices where previously male workers had to figure out which post office went with which address now the zip code provided that information for them the government promoted the new system with the cartoon character mr. zip and a new song from the zip code lovin band called the swinging six and it worked by 1969 83% of Americans were using zip codes in between 1971 and 1980 the number of pieces of mail that were processed per year increased by 17 billion but the system was limited zip codes are made from digits unlike the alph