![]() ![]() When you enter the full street address, the app determines the most probable ZIP code for that specific street address. The lookup feature currently supports locations from all 50 states of the United States. With ZIP Code Lookup, you can find the ZIP codes using street address, city and state, and the ZIP code itself. The ZIP code finder utility offered by this app utilizes the coordinate information to retrieve the corresponding ZIP code for the addresses from all across the US. The public and business mailers alike adapted well to its use.ZIP Code Lookup locates the ZIP code associated with any US-based location for free. At first, use of the new code was not mandatory for anyone, but in 1967, the Department required mailers of second- and third-class bulk mail to presort by ZIP Code. The final two digits designated small Post Offices or postal zones in larger zoned cities. ![]() ![]() This number was followed by two digits that more closely pinpointed population concentrations and those sectional centers accessible to common transportation networks. The first digit designated a broad geographical area of the United States, ranging from zero for the Northeast to nine for the far West. The existence of postal zones in the larger cities, set in motion in 1943, helped to some extent, but in cases where the old zones failed to fit within the delivery areas, new numbers had to be assigned.īy July 1963, a five-digit code had been assigned to every address throughout the country. Once these sectional centers were delineated, the next step in establishing the ZIP Code was to assign codes to the centers and the postal addresses they served. The Metro concept was expanded and eventually became the core of 552 sectional centers, each serving between 40 and 150 surrounding Post Offices. Called the Metro System, these transportation centers were set up around 85 of the country’s larger cities to deflect mail from congested city streets. The Post Office Department had previously recognized that new avenues of transportation would open and had begun to establish focal points for air, highway, and rail transportation. Preparing for the new system involved a realignment of the mail system. Edward Day announced that the ZIP Code would launch July 1, 1963. A number of coding programs were examined and discarded before the Department selected a system advanced by Department officials. One was the development of a coding system, an idea the Department had considered for a decade or more. In June 1962, after a study of mechanization, the presidentially appointed Advisory Board of the Post Office Department made several recommendations. Yet while mail volume grew and while the Post Office Department had been at the forefront of advances in transportation, the methods and much of the equipment used to sort mail in thousands of Post Offices remained the same as in Benjamin Franklin’s day. The development of the computer brought centralization of accounts and sent a growing mass of utility bills and payments, bank deposits and receipts, advertising, magazines, credit card transactions, mortgage bills and payments, and Social Security checks through the mail. By 1963, 80 percent of all mail in the United States was business mail. The social correspondence of the 19th century had given way, gradually then explosively, to business mail. Twenty years later, the Department implemented an even farther reaching plan, the Zoning Improvement Plan (ZIP) Code. Under this system, delivery units or zones were identified by one or two numbers between the city and state - for example, Birmingham 7, Alabama - so that mail could be separated by employees who did not have detailed scheme knowledge. To offset the loss, in May 1943 the Post Office Department began a zoning address system in 124 of the largest cities. Look Up a ZIP Code by address, by city or by state from the official source, the United States Postal Service:Ĭlick to Lookup Zip Code By City and StateĬlick to How To Read A ZIP Code History of the ZIP Codeĭuring World War II, thousands of experienced postal employees left to serve with the military.
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