A postal code is a series of numbers that helps sort and distribute mail. These are commonly used to define a region, city, state, or country. The code may include letters, numbers, and punctuation. The first three digits of a ZIP code represent the delivery zone. This is followed by two more digits that are not usually used. For example, the zip codes for the cities of Louisville, KY and Des Moines, IA are 40202 and 50309, respectively. Zip codes were invented by the United States Postal Service. They are usually assigned to the region's main city. In addition to being an effective means of sorting and delivering mail, a ZIP code also has other useful uses. These include calculating shipping rates and sorting packages. Originally a five-digit code, the modern system was shortened to four digits in 1983. Initially, the digits were allocated according to the location of the mail. But with the country's population increasing, this process became cumbersome. To speed up the delivery of mail, a new system was devised. This system relied on a defined numerical system, and required less time and effort on the part of mail carriers. It was also believed that the new system would help deliver mail quicker, but it took a while for people to get on board. Eventually, the new system was implemented, and mail delivery was improved. Although the new system made a lot of people's lives easier, it also enraged many. Some people refused to use the new system.
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