{"id":195,"date":"2022-05-06T17:49:59","date_gmt":"2022-05-06T14:49:59","guid":{"rendered":"https:\/\/my-operator.info\/en\/?p=195"},"modified":"2022-05-09T09:29:24","modified_gmt":"2022-05-09T06:29:24","slug":"zip-4","status":"publish","type":"post","link":"https:\/\/my-operator.info\/en\/faq\/zip-4\/","title":{"rendered":"ZIP plus 4 | Structure and meaning of 4 last digits of ZIP"},"content":{"rendered":"<p>5-digit ZIP code is the most familiar format which was introduced in 1963 by the US Postal Service (USPS). However, in addition to it, there is also the extended ZIP + 4 code, appeared in 1983.<\/p>\n<h2>What is ZIP plus 4?<\/h2>\n<p>ZIP plus 4 code is a 9-digit combination, which can be also called \u201cadd-on codes\u201d, \u201cadd-ons\u201d, \u201c+4 codes\u201d or something like that.<\/p>\n<p>It consists of two parts:<\/p>\n<ul>\n<li>Usual ZIP code. It is the first 5 digits, which are enough for routing purposes.<\/li>\n<li>4-digit code continuation, which may or may not be required to identify the delivery destination.<\/li>\n<\/ul>\n<blockquote><p><em>A simple 5-digit ZIP code is easy to identify with our tool. Go to the section \u201c<a href=\"https:\/\/my-operator.info\/en\/my-zip-code\/\" target=\"_blank\" rel=\"noopener\"><strong>What\u2019s my ZIP code<\/strong><\/a>\u201d to find out yours.<\/em><\/p><\/blockquote>\n<p>The last 4 digits of ZIP code help to identify geographic segment within the 5-digit delivery area more accurately. For example they might mean a post office box, a group of apartments, an individual high-volume receiver of mail, a city block or a specific delivery route. In addition, ZIP plus four codes provides an opportunity to avoid misdeliveries.<\/p>\n<h2>Why may 4 last digits of ZIP code change?<\/h2>\n<p>One more feature of ZIP code plus four is that 4 last digits may be changed. Unlike 5-digit ZIP codes, which are based on permanent boundaries, ZIP + 4 is based on delivery routes.<\/p>\n<blockquote><p><em>In fact 5-digit ZIP codes also change, but it happens really rarely, while ZIP code plus 4 can be changed as frequently as once a month. It is one of the reasons why ZIP plus 4 lookup might lose its relevance.<\/em><\/p><\/blockquote>\n<h2>What are the last four digits of a ZIP code?<\/h2>\n<p>The most reliable way is to use official software of delivery companies, such as USPS, which updates a ZIP + 4 Code as frequently as once in two months approximately.<\/p>\n<p>The list of US postal codes without last 4 digits can be found on our website in the section \u201c<strong>All ZIP codes<\/strong>\u201d. Choose your state, county and city to know more.<\/p>\n<h2>What\u2019s \u201cZIP plus four\u201d structure?<\/h2>\n<p>We\u2019ve already told about ZIP codes structure in our article \u201c<a href=\"https:\/\/my-operator.info\/en\/faq\/what-is-a-zip-code\/\" target=\"_blank\" rel=\"noopener\"><strong>What is a ZIP code<\/strong><\/a>?\u201d, so let&#8217;s take a closer look at the structure of the last 4 digits:<\/p>\n<ul>\n<li>The sixth and seventh digits of ZIP codes plus four often mean a specific street or a large building.<\/li>\n<li>The last two digits (eighth and ninth) show one of the following reference point: side of the street, large building or its floor.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-197\" src=\"https:\/\/my-operator.info\/en\/wp-content\/uploads\/sites\/2\/ZIP-4-code-format.png\" alt=\"ZIP + 4 code format\" width=\"1049\" height=\"621\" srcset=\"https:\/\/my-operator.info\/en\/wp-content\/uploads\/sites\/2\/ZIP-4-code-format.png 1049w, https:\/\/my-operator.info\/en\/wp-content\/uploads\/sites\/2\/ZIP-4-code-format-300x178.png 300w, https:\/\/my-operator.info\/en\/wp-content\/uploads\/sites\/2\/ZIP-4-code-format-1024x606.png 1024w\" sizes=\"(max-width: 1049px) 100vw, 1049px\" \/><\/p>\n<h3>It is possible not to use last 4 digits of ZIP codes?<\/h3>\n<p>Yes, most of clients just need to know the address or 5-digit ZIP-code. However, there were some attempts to promote universal use of the new format in USA, its creators met with public resistance, so nowadays the 4 + ZIP is not required.<\/p>\n<p>In addition postal companies are able to determine the correct ZIP+4 code from the address on the mail on theirs\u2019s own \u2014 by a multiline optical character reader (MLOCR). After identifying they form and print an Intelligent Mail barcode (IM) on the face of the mail piece that corresponds to 11 digits: nine for the ZIP plus 4 code and two for the delivery point.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>5-digit ZIP code is the most familiar format which was introduced in 1963 by the US Postal Service (USPS). However, in addition to it, there is also the extended ZIP + 4 code, appeared in 1983. What is ZIP plus 4? ZIP plus 4 code is a 9-digit combination, which can be also called \u201cadd-on&#8230;<\/p>\n","protected":false},"author":3,"featured_media":198,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[12],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ZIP + 4 | What do 4 last digits of ZIP code mean?<\/title>\n<meta name=\"description\" content=\"What do ZIP Plus 4 codes needed for? Know more about structure, meaning, history of appearance &amp; other details about the four extra numbers. 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