PA Zip Code History and Information

How the Zip Code Began

The United States Post Office Department first implemented postal zones for large cities in 1943. By the early 1960s a more general system was needed, and on July 1, 1963, non-mandatory ZIP codes were announced for the whole country. Robert Moon, an employee of the post office, is considered the father of the ZIP code. ZIP codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group and the fourth and fifth digits representing a group of delivery addresses within that region. The main town in a region often gets the first ZIP codes for that region; afterward, the numerical order often follows the alphabetical order. Because ZIP codes are intended for efficient postal delivery, there are unusual cases where a ZIP code crosses state boundaries, such as a military facility spanning multiple states or remote areas of one state most easily serviced from an adjacent state.

U.S. Zip Code Bar Codes

The ZIP code is often translated into a barcode called Postnet that is printed on the mailpiece to make it easier for automated machines to sort. Unlike most barcode symbologies, Postnet uses long and short bars, not thin and thick bars. The post office generally uses OCR technology, though a human may have to read the address if absolutely necessary. The automated machinery has the tendency to paste the coding over the bottom half-inch of postcards, often obliterating the signature. Postcard printers have begun blocking a section off where the barcode will be placed. To print a bar code mailing lists must be standardized with up-to-date CASS certified software that adds and verifies a full, correct ZIP + 4 code and an additional two digits representing the exact delivery point. Furthermore, mail must be sorted in a specific scheme and be accompanied by documentation verifying this.

Chevrolet Dealer Zip Codes in PA

19020	19067	19047	19054	19055
19057	18966	19053	19154	18940

Zip Codes Philadelphia Chevy Dealer

19021

19114

19056

19007

19030

Zip Code + 4

The last four digits are like a ZIP code within a Zip code. In 1983 the U.S. Postal Service began using the expanded ZIP (Zone Improvement Plan) code in order to expedite shipping to specific office blocks, mailing centers, and other areas that receive a high volume of mail. The last four numbers aren't mandatory, but they can help expedite delivery. You can find the "ZIP + 4" of any address in the United States by using this tool from the Postal Service. The USPS also explains how ZIP codes break down: the first three numbers indicate a "sectional center" or large city, the second two indicate the specific post office facility, the third two indicate a sector or several blocks, and the last two indicate a segment or side of a street. Today, there are four types of ZIP codes: Unique (assigned to a single high-volume address), P.O.-box-only (used only for P.O. boxes at a given facility, not for any other type of delivery), Military (used to route mail for the U.S. military) and Standard (all other ZIP codes).

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