{"id":520,"date":"2020-05-19T20:50:00","date_gmt":"2020-05-19T20:50:00","guid":{"rendered":"https:\/\/www.simplywise.com\/blog-2023\/?p=520"},"modified":"2026-10-16T17:27:04","modified_gmt":"2026-10-16T17:27:04","slug":"how-are-social-security-numbers-formulated","status":"publish","type":"post","link":"https:\/\/www.simplywise.com\/blog\/how-are-social-security-numbers-formulated\/","title":{"rendered":"How are Social Security Numbers Formulated?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"520\" class=\"elementor elementor-520\">\n\t\t\t\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a1c0de1 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a1c0de1\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-a1c0de2\" data-id=\"a1c0de2\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a1c0de3 elementor-widget elementor-widget-html\" data-id=\"a1c0de3\" data-element_type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<!-- YOAST_TITLE: Social Security Numbers: How the 9 Digits Are Assigned \/ YOAST_METADESC: How are Social Security numbers assigned? 9 digits in 3 parts: a 3-digit area number, a 2-digit group number and a 4-digit serial. Random since 2011. \/ YOAST_FOCUSKW: social security numbers -->\n<script>\ndocument.addEventListener('DOMContentLoaded', function() {\n  var sels = ['.entry-header','.page-header','article > h1:first-child','.entry-footer'];\n  sels.forEach(function(s){document.querySelectorAll(s).forEach(function(el){el.style.display='none';});});\n  var el = document.querySelector('.sw-a');\n  while (el && el !== document.body) {\n    el.style.maxWidth='100%'; el.style.width='100%'; el.style.padding='0'; el.style.margin='0';\n    el.style.float='none'; el.style.flex='0 0 100%';\n    el = el.parentElement;\n  }\n  document.body.style.marginTop='0'; document.body.style.paddingTop='0';\n});\n<\/script>\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Inter:wght@400;500;600;700;800&display=swap\" rel=\"stylesheet\">\n<style id=\"pm-style\">.single-post .entry-header,.single-post .entry-meta,.single-post .page-header,.single-post article>h1:first-child{display:none !important;}.single-post 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24px 26px;margin:32px 0;text-align:center}.pm .pm__legacy-title{font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#2563eb;margin:0 0 8px}.pm .pm__legacy-desc{margin:0 0 16px}.pm .pm__sources-title{font-size:20px;font-weight:700;color:#111827;margin:0 0 10px}.pm .pm__legacy-btnrow{margin:24px 0;text-align:center}.pm .pm__body ul,.pm .pm__body ol:not(.pm__steps){padding-left:1.3em}.pm .pm__body li{margin:0 0 8px}.pm .pm__body h4{font-size:18px;margin:24px 0 8px}.entry-content>img.featured-image{display:none!important}@media (max-width:600px){.pm .pm__legacy{padding:20px 18px 22px;margin:26px 0}.pm .pm__fig--inline{margin:22px 0}}<\/style>\n<article class=\"pm sw-a\">\n<header class=\"pm__hero\">\n<div class=\"pm__inner\">\n<nav class=\"pm__crumb\">Blog &nbsp;&rsaquo;&nbsp; Social Security<\/nav>\n<h1>How are Social Security Numbers Formulated?<\/h1>\n<div class=\"pm__dek-cta\">In a hurry? <a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Turn a photo into an itemized estimate<\/a> in about 6 seconds.<\/div><div class=\"pm__rating\"><span class=\"pm__stars\">&#9733;&#9733;&#9733;&#9733;&#9733;<\/span> <b>4.8<\/b> <span class=\"pm__rating-sub\">on the App Store<\/span><\/div>\n<div class=\"pm__meta\">\n<span>SimplyWise<\/span>\n<i><\/i>\n<span>Updated October 16, 2026<\/span>\n<i><\/i>\n<span>6 min read<\/span>\n<\/div>\n<figure class=\"pm__fig\"><img decoding=\"async\" src=\"https:\/\/www.simplywise.com\/blog\/wp-content\/uploads\/2023\/06\/shutterstock_1518677039.jpeg\" alt=\"what is a SS number\" loading=\"eager\"><\/figure>\n<\/div>\n<\/header>\n<div class=\"pm__body\">\n<div class=\"pm__inner\">\n<aside class=\"pm__legacy\"><div class=\"pm__legacy-title\">DID YOU KNOW?<\/div><div class=\"pm__legacy-desc\">Retirement is 99% easier when your paperwork is organized.<br>Join 250,000+ Americans securely storing their important receipts, bills &amp; documents with the SimplyWise app.<\/div><a class=\"pm__btn\" href=\"https:\/\/simplywise.app.link\/Iv0wVANrvfb\" target=\"_blank\" rel=\"noopener\">Get the App<\/a><\/aside>\n<style>\/*! elementor - v3.13.3 - 28-05-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style> <p>Most of us don\u2019t really know what our Social Security number means. Why is one person\u2019s number so very different from someone who was born in the same hospital a few years later? Do they recycle Social Security numbers? What do those three sequences represent? And what is a Social Security number?<\/p><p>According to the Social Security Administration\u2019s<a href=\"https:\/\/www.ssa.gov\/policy\/docs\/ssb\/v69n2\/v69n2p55.html\">\u00a0history of Social Security numbers<\/a>, the numerical sequence was the system the three-member<a href=\"https:\/\/www.ssa.gov\/history\/orghist.html\">\u00a0Social Security Board<\/a>\u00a0finally agreed on to enable them to track workers\u2019 earnings throughout their lives. They couldn\u2019t just use people\u2019s names and addresses, because people move around. Besides, using just names and addresses could lead to a lot of confusion. As one 1937 article noted:<\/p><p>\u201cA recent news account states that the Fred Smiths of New York City have had so much trouble in being identified by their creditors, the courts, and even their friends, that they have joined together in forming the \u2018Fred\u00a0Smiths, Incorporated,\u2019 to serve as a clearing house for their identification problems.\u201d<\/p><p><b>So, they had to come up with a more unique identifier. The Social Security number, now used by most agencies and businesses to identify individuals, is the one they landed on.<\/b><\/p><h3><b>How are the first 3 digits of your social security number determined?\u00a0<\/b><br\/><b>1936-1972<\/b><\/h3><p>The first three numerals in a Social Security number are called the Area Number.\u00a0The area number doesn\u2019t correlate with where the worker lives. Initially it might have been designed to do so, but it didn\u2019t really turn out that way.\u00a0<\/p><p>After a lot of deliberation and debate about how to distribute Social Security numbers to the workers of America, it was decided to send out 10,000 numbers to each post office in the country to distribute to people registering for the\u00a0Old Age Pension\u00a0fund.\u00a0In general, the lower numbers were given on the east coast and the numbers rose the farther west the post office was. As you can imagine, some post offices ran out of numbers faster than others.<\/p>\n<figure class=\"pm__fig pm__fig--inline\"><img decoding=\"async\" src=\"https:\/\/www.simplywise.com\/blog\/wp-content\/uploads\/2020\/05\/Screen-Shot-2023-06-15-at-3.52.05-PM.png\" alt=\"\" width=\"640\" height=\"538\" loading=\"lazy\"><\/figure>\n<p>However, not all the workers got Social Security numbers in their own postal districts. There was no rule you had to apply for Social Security in the state where you lived. You could apply anywhere. Also, many big corporations with employees around the country had their employee register in the state where the corporation was based. So, someone who lived in Las Vegas might have a Social Security number from the Chicago area. You can find<a href=\"https:\/\/www.ssa.gov\/employer\/stateweb.htm\">\u00a0a list of these area numbers<\/a> on the Social Security website.<\/p>\n<p class=\"pm__inline-cta\"><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Turn a photo into an itemized estimate, free &rarr;<\/a><\/p>\n<h3><b>1972-Present<\/b><\/h3><p>Starting in 1972, the administration moved the processing of all Social Security applications to Baltimore. After that, the area number reflected the zip code of the applicant\u2019s mailing address. But many people have mailing addresses in places other than where they live. Then around 2007, the administration started working on a plan to address the fact that some heavily populated places were running out of numbers while sparsely populated places had more than enough. They decided to start randomly assigning numbers out of the remaining pool and began doing so<a href=\"https:\/\/www.ssa.gov\/employer\/stateweb.htm\">\u00a0in 2011<\/a>. Now the area numbers don\u2019t really correspond to anything geographical.<\/p><h3><b>Exceptions<\/b><\/h3><p>There are some interesting exceptions to the area numbers corresponding to a place, even before 1973. For example, until 1963, sequence 700-728 belonged to railroad workers. More recently, numbers 729-733 were allocated to the Department of Homeland Security to be issued through the Enumeration at Entry program. The number 586 was divided among American Samoa, Guam, the Philippines, Americans employed abroad by American employers. Numbers 587 through 588, and numbers 589 through 595, were assigned to Mississippi and Florida, respectively, to be used after those states exhausted their initial area numbers. Another interesting point: No area is ever expected be assigned 000 or 666.<\/p><h3><b>The second 2 numbers: Group number<\/b><\/h3><p>Periodically, a rumor goes around that the group number identifies a particular racial group. That\u2019s not true. The group number was actually created to help SSA employers whose records at that time were kept in filing cabinets, so that finding anything required very specific coding.<\/p>\n<p>So the thousands, and then millions, of workers were \u201cgrouped\u201d into sections. First they were divided by area number, then separated by a pattern of numbers that make up the two-digit group number. The group records follow this pattern. The first group of numbers in a given area would be followed by\u00a0odd numbers from 01 through 09. For example if the area is 555, the group numbers would be 555-01, 555-03, 555-05\u2026.<\/p><p>When they\u2019ve issued 555-09, they would switch to even numbers from 10 through 98, such as 555-10, 555-12.\u00a0Once they run out of these numbers, they switch to even groups 02-08, followed by odd groups 11-99. \u00a0<\/p>\n<figure class=\"pm__fig pm__fig--inline\"><img decoding=\"async\" src=\"https:\/\/www.simplywise.com\/blog\/wp-content\/uploads\/2020\/05\/Screen-Shot-2023-06-15-at-3.53.11-PM.png\" alt=\"\" width=\"631\" height=\"564\" loading=\"lazy\"><\/figure>\n<h3><b>The last 4 numbers: Serial Number<\/b><\/h3><p>The last four digits are the serial number. In each group, the serial numbers run consecutively from 0001 through 9999.<\/p><h3>What does your SSN reveal about you?<\/h3><p>Not much. The first three numbers might tell where you were when you applied, or where you had a mailing address when you applied, or where your employer was based when you applied, or nothing about your whereabouts at all. They don\u2019t tell anything about where you are now, or where you\u2019ve been since applying. The second number gives a very rough idea at what point in the last 100 years you might have received your number. But in order to guess that, someone would have to know how many numbers were given out with a specific area number over each of the last 80 years.\u00a0<\/p>\n<section class=\"pm__promo\"><p>SimplyWise Cost Estimator turns a photo of the job into an itemized estimate in about 6 seconds: materials, labor, and a total you can send. Free to try for 7 days, then $29.99\/mo or $239.99\/yr.<\/p><a class=\"pm__btn\" href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Try SimplyWise Cost Estimator, free<\/a><\/section>\n<figure class=\"pm__fig pm__fig--inline\"><img decoding=\"async\" src=\"https:\/\/www.simplywise.com\/blog\/wp-content\/uploads\/2020\/05\/Screen-Shot-2023-06-15-at-3.54.55-PM.png\" alt=\"\" width=\"640\" height=\"523\" loading=\"lazy\"><\/figure>\n<p>The last four give a slightly closer approximation, but only slightly.<\/p><p>At one point the people debating how to identify workers considered using fingerprints, like the armed services did. But then it was decided that many people associate fingerprinting with criminal activity, so that idea was discarded. The current system reveals much less than a fingerprint would have.<\/p>\n<h3><b>Do they recycle Social Security numbers?<\/b><\/h3><p>At first, they thought they would recycle numbers. One of the early ideas was to make the group number correspond to the year someone would turn 65, then give the number to someone else. But there were unemployment compensation delegates to the Social Security Board who worried that workers would falsify their age, perhaps to retire early or work longer. The next plan was to have a two-digit month of birth, but that was also rejected. The final decision was that the middle two digits wouldn\u2019t reflect age at all but would be used as a group number that would help the existing punch card machines sort the various applicants and recipients.<\/p><h3><b>Will they run out of Social Security numbers?<\/b><\/h3><p>At present, the SSA<a href=\"https:\/\/www.ssa.gov\/policy\/docs\/ssb\/v69n2\/v69n2p55.html\">\u00a0has distributed some 450 million<\/a>\u00a0numbers and has some<a href=\"https:\/\/www.ssa.gov\/employer\/randomization.html\">\u00a0420 million numbers<\/a>\u00a0available for distribution. So it\u2019s likely the system will be around for awhile. Unfortunately, because data entry has sometimes been done by people, one study showed many people have<a href=\"https:\/\/www.cnbc.com\/id\/38678753\">\u00a0multiple Social Security numbers associated with their names<\/a>\u00a0and many Social Security numbers are associated with up to five people. No system is foolproof. But most people have only one Social Security number that can be used to ensure they receive the benefits they have worked toward all their lives.<\/p><p>Because of the importance of this number, it\u2019s key not to share it as a form of identification unless absolutely necessary. You are, in general, the only person in the world with your number. That\u2019s pretty special.<\/p>\n<p class=\"pm__inline-cta\"><a href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Price your next job from a photo with SimplyWise, free &rarr;<\/a><\/p>\n<aside class=\"pm__legacy\"><div class=\"pm__legacy-title\">DID YOU KNOW?<\/div><div class=\"pm__legacy-desc\">Retirement is 99% easier when your paperwork is organized.<br>Join 250,000+ Americans securely storing their important receipts, bills &amp; documents with the SimplyWise app.<\/div><a class=\"pm__btn\" href=\"https:\/\/simplywise.app.link\/Iv0wVANrvfb\" target=\"_blank\" rel=\"noopener\">Get the App<\/a><\/aside>\n<div class=\"pm__sources\"><div class=\"pm__sources-title\">Sources<\/div><ul><li>ssa.gov: <a href=\"https:\/\/www.ssa.gov\/policy\/docs\/ssb\/v69n2\/v69n2p55.html\" rel=\"noopener\" target=\"_blank\">history of Social Security numbers<\/a><\/li><li>ssa.gov: <a href=\"https:\/\/www.ssa.gov\/history\/orghist.html\" rel=\"noopener\" target=\"_blank\">Social Security Board<\/a><\/li><li>ssa.gov: <a href=\"https:\/\/www.ssa.gov\/employer\/stateweb.htm\" rel=\"noopener\" target=\"_blank\">a list of these area numbers<\/a><\/li><li>ssa.gov: <a href=\"https:\/\/www.ssa.gov\/employer\/randomization.html\" rel=\"noopener\" target=\"_blank\">420 million numbers<\/a><\/li><li>cnbc.com: <a href=\"https:\/\/www.cnbc.com\/id\/38678753\" rel=\"noopener\" target=\"_blank\">multiple Social Security numbers associated with their names<\/a><\/li><\/ul><\/div>\n<\/div>\n<\/div>\n<section class=\"pm__final\"><div class=\"pm__inner\"><span class=\"pm__eyebrow\">SimplyWise Cost Estimator<\/span><h2>Price the job from a photo.<\/h2><p>Snap a photo and get an itemized estimate you can edit and send. Free to try for 7 days.<\/p><a class=\"pm__btn pm__btn--lg\" href=\"https:\/\/swcostestimator.app.link\/ce-ai\" rel=\"noopener\" target=\"_blank\">Try SimplyWise, free<\/a><\/div><\/section>\n<\/article>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Article\",\n  \"headline\": \"How are Social Security Numbers Formulated?\",\n  \"description\": \"How are Social Security numbers assigned? 9 digits in 3 parts: a 3-digit area number, a 2-digit group number and a 4-digit serial. 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The Social Security Administration has distributed some 450 million numbers and still has some 420 million numbers available, so the system will likely be around for a while.<\/p><\/details><details style=\"border-top:1px solid #e2e8f0;padding:12px 0;\"><summary style=\"font-weight:600;cursor:pointer;line-height:1.4;\">Does my Social Security number reveal where I was born?<\/summary><p style=\"margin:10px 0 0;line-height:1.6;\">Not much. The first three digits might reflect where you applied, where your mailing address was, or where your employer was based, or nothing about your whereabouts at all. Since 2011, numbers have been randomly assigned, so area numbers no longer correspond to anything geographical.<\/p><\/details><\/section><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What do the three parts of a Social Security number mean?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The first three digits are the area number, the middle two digits are the group number originally created to help sort filing cabinet records, and the last four digits are the serial number, which runs consecutively from 0001 through 9999 within each group.\"}},{\"@type\":\"Question\",\"name\":\"Do they recycle Social Security numbers?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Early planners considered recycling numbers, but the final system does not reuse them. The Social Security Administration has distributed some 450 million numbers and still has some 420 million numbers available, so the system will likely be around for a while.\"}},{\"@type\":\"Question\",\"name\":\"Does my Social Security number reveal where I was born?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not much. The first three digits might reflect where you applied, where your mailing address was, or where your employer was based, or nothing about your whereabouts at all. Since 2011, numbers have been randomly assigned, so area numbers no longer correspond to anything geographical.\"}}]}<\/script>","protected":false},"excerpt":{"rendered":"<p>Blog &nbsp;&rsaquo;&nbsp; Social Security How are Social Security Numbers Formulated? In a hurry? Turn a photo into an itemized estimate in about 6 seconds.&#9733;&#9733;&#9733;&#9733;&#9733; 4.8 on the App Store SimplyWise Updated October 16, 2026 6 min read DID YOU KNOW?Retirement is 99% easier when your paperwork is organized.Join 250,000+ Americans securely storing their important receipts, [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":521,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"social security numbers","_yoast_wpseo_title":"Social Security Numbers: How the 9 Digits Are Assigned","_yoast_wpseo_metadesc":"How are Social Security numbers assigned? 9 digits in 3 parts: a 3-digit area number, a 2-digit group number and a 4-digit serial. Random since 2011.","_yoast_wpseo_linkdex":"57","_yoast_wpseo_content_score":"30","_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_canonical":"","inline_featured_image":false,"footnotes":""},"categories":[186],"tags":[],"class_list":["post-520","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-social-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Social Security Numbers: How the 9 Digits Are Assigned<\/title>\n<meta name=\"description\" content=\"How are Social Security numbers assigned? 9 digits in 3 parts: a 3-digit area number, a 2-digit group number and a 4-digit serial. 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