[DOC] [TLE] The Mailing Industry and the United States Postal Service [PAR] Parcel Post electrified the mail order industry: Sears filled five times as many ... 
New services like rural free delivery and Parcel Post, cheap postage rates for ..... 
To cope with rising mail volumes, the Department also needed to work more 
efficiently. .... which added a hyphen and four digits to the existing five-digit ZIP 
Code. [DOC] [TLE] Postal Mechanization - APWU Iowa [PAR] In 1959, the Post Office Department also awarded its first volume order for ... To 
reduce the number of mail piece handlings, the Postal Service began to ... ZIP+4 
code in 1983, the first delivery phase of the new OCR channel sorters ... 
Introduced in 1983, the ZIP+4 code added a hyphen and four digits to the existing 
five-digit... [DOC] [TLE] Postal Facts 2016 - about USPS [PAR] The United States Postal Service delivers more mail to more addresses in a 
larger geographical ... number of new delivery points added to the network in 
2015. [DOC] [TLE] Publication 119 - Sources of Historical Information on ... - about USPS [PAR] provide prompt, reliable, and efficient services to ... 1830s, to online stamp sales 
in 1997, to new ... Post Offices, postal employees, mail routes, ... Orders of the 
Postmaster General ... Establishment dates of rural free delivery, by ... most of the 
1890 records were destroyed .... Five-Digit ZIP Code and Post Office Directory. [DOC] [TLE] Organizing America: A History of the ZIP Code - Random History [PAR] Jul 25, 2014 ... A history of the U.S. ZIP Code from its beginnings in the U.S. Postal ... over the 
years, from a way to more efficiently sort and deliver mail to ... A letter that took 
three days from Philadelphia to New York City in .... In 1983, the USPS expanded 
the number of digits in the ZIP Code to nine and called it ZIP+4. [DOC] [TLE] Postal Service: Automation Is Taking Longer and Producing Less ... [PAR] For many routes, there has not been enough delivery-sequenced letters given to 
the .... Most letter mail was sorted on large letter sorting machines that relied on ... 
In 1983, the Service added four digits to the ZIP Code, (ZIP+4), enabling mail to 
.... be added to the Service's existing equipment rather than creating whole new... [DOC] [TLE] Careers in Post Office Career Field - IResearchNet [PAR] The postal service touches the lives of virtually everyone in the nation. ... The 
number of post offices climbed from just 75 in 1789 to a peak of nearly 77,000 ... 
for new ways to process and deliver mail more efficiently to offset growing postal 
deficits. ... this system, called zip + 4, adds four digits to the end of existing zip 
codes. [DOC] [TLE] United States Postal Service - Wikipedia [PAR] The United States Postal Service (USPS) is an independent agency of the United 
States government responsible for providing postal service in the United States. It 
is one of the few government agencies explicitly authorized by the United States 
Constitution. The U.S. Mail traces its roots to 1775 during the Second Continental 
... Since the early 1980s, many of the direct tax subsidies to the Post Office... [DOC] [TLE] postal service as a business - Worcester Polytechnic Institute [PAR] reestablished those routes and also added routes to locations farther west, .... 
digit code was used to help people with less familiarity with the system, sort mail. 
.... In the late 1990's and early 2000's, the postal service offered many new ... end 
of 2002, the Postal Service delivered 22 billion more pieces of mail to 12 million. [DOC] [TLE] U. S. Postal History Timeline - Sussex - Lisbon Area Historical Society [PAR] Mar 3, 2005 ... also see Post Offices, Postmasters, Mail Carriers and Mail Delivery History for ... 
The Post Office Department recognized the value of this new mode of .... Many 
transportation events in postal history were marked by great ..... Introduced in 
1983, the ZIP+4 code added a hyphen and four digits to the existing... [DOC] [TLE] The Untold Story of the ZIP Code - DocPlayer.net [PAR] Today, the ZIP Code is much more than

Question: In order to deliver mail more efficiently, the USPS added this many new digits to existing ZIP codes in 1983
Answer: four