What do the 2 middle numbers in social security mean

Social Security Numbers (SSN) in the United States are distributed by the Social Security Administration (SSA). Unlike in other countries where national identification numbers provide a wealth of information, such as Mexico or in the Balkans, an individual’s SSN may not contain a great amount of personally identifiable information (PII). However, it can provide the individual’s state of application or mailing address at the time they applied for a SSN that was issued prior to the implementation of SSN Randomization on June 25, 2011.

Social Security Numbers are made up of nine digits split into three sections: an area number (A), a group number (G), and a serial number (S). The format for SSNs is:

AAA-GG-SSSS

Area Number

For SSNs issued between 1936—when they were first introduced—and 1972, the three digit area number (A) corresponds to the state in which the individual applied for their SSN. Between 1972 and June 25, 2011, while the area numbers of the SSN still correspond to a state, they are based on the ZIP code of the individual’s mailing address when they applied for a SSN.

Group Number

The group number (G), or second set of digits, refers to the specific order in which SSNs are distributed within a geographical area from 01 to 99. First, odd numbers are assigned from 01 to 09 followed by even numbers from 10 to 98. Then, even numbers are assigned from 02 to 08. Last, odd numbers from 11 to 99 are assigned.

It is possible to determine if a social security number is valid using the SSA’s High Group History List. The SSA published the highest group number that is issued each month according to each area number. This means that any group numbers below the highest, according to the assigning pattern, are valid.

Serial Number

The final section, made up of four numbers, is assigned consecutively from 0001 to 9999.

This can be useful for validating a SSN or determining the state of an individual’s mailing address. While social security numbers are not readily available or able to be looked up, they may sometimes appear on older public documents.

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What do the 2 middle numbers in social security mean
An overview of how social security numbers are assigned.

The purpose of this article is to help you understand how Social Security Numbers are assigned. In 2011, the Social Security Administration (SSA) changed the way they assign Social Security Numbers (SSNs). The new method uses a process called “randomization” to assign SSNs.

The Administration developed a new method to help protect the integrity of the SSN and to extend the longevity of the nine-digit SSN (instead of adding additional digits).

SSN Randomization changes the assignment process in a number of ways. First, it eliminates the geographical importance of the first three digits. Also, the new randomization process eliminates the significance of the highest group number.

As a result, the High Group List is frozen in time and can only be used to see the area and group numbers SSA issued prior to the randomization implementation date.

In the United States, a Social Security number is a number issued to U.S. citizens, permanent residents, and people that are temporarily working in the country. The number is issued to an individual by the SSA, an agency of the federal government.

Its primary purpose is tracking working individuals for taxation purposes and to track Social Security benefits. Since it was initially introduced, the SSN has become the primary national identification number, even though it was not originally intended to be used as a form of identification.

History

Since 1972, numbers have been issued by the central office. The first three (3) digits of a person’s social security number are determined by the ZIP Code of the mailing address shown on the application for a social security number.

Previously, prior to 1972, social security numbers were assigned by SSA field offices. The number merely established that his/her card was issued by one of the SSA offices in that State.

Randomization

In 2011, the SSA changed the assignment process to a process known as SSN randomization. This process eliminates the geographical significance of the first three digits of the number. Below is an explanation of how the numbers were assigned under the old system that was in effect prior to 2011.

The Social Security number consists of nine (9) digits, usually written in the format – 1 2 3 – 4 5 – 6 7 8 9. The first three digits of a social security number denote the area (or State) where the application for an original Social Security number was filed.

Within each area, the group number (middle two (2) digits) range from 01 to 99 but are not assigned in consecutive order. For administrative reasons, group numbers issued first consist of the ODD numbers from 01 through 09 and then EVEN numbers from 10 through 98, within each area number allocated to a State.

After all numbers in group 98 of a particular area have been issued, the EVEN Groups 02 through 08 are used, followed by ODD Groups 11 through 99.

Within each group, the serial numbers (last four (4) digits) run consecutively from 0001 through 9999.

The chart below shows how Group numbers are assigned:

  • ODD – 01, 03, 05, 07, 09——EVEN – 10 to 98<
  • EVEN – 02, 04, 06, 08——ODD – 11 to 99

Follow is a list of social security number prefixes for each state. The listing is organized in ascending order based on the SSN prefix, with the corresponding issuing state listed. Remember, these apply only to numbers issued prior to 2011 under the old system.

SSN Prefix = Issuing State

001-003 = New Hampshire
004-007 = Maine
008-009 = Vermont
010-034 = Massachusetts
035-039 = Rhode Island
040-049 = Connecticut
050-134 = New York
135-158 = New Jersey
159-211 = Pennsylvania
212-220 = Maryland
211-222 = Delaware
223-231 = Virginia
232 = North Carolina
232 = West Virginia
233-236 = West Virginia
237-246 = North Carolina
247-251 = South Carolina
252-260 = Georgia
261-267 = Florida (Also 589-595)
268-302 = Ohio
303-317 = Indiana
318-361 = Illinois
362-386 = Michigan
387-399 = Wisconsin
400-407 = Kentucky
408-415 = Tennessee
416-424 = Alabama
425-428 = Mississippi
429-432 = Arkansas
433-439 = Louisiana
440-448 =Oklahoma
449-467 = Texas
468-477 = Minnesota

478 – 485 = Iowa
486 – 500 = Missouri
501 – 502 = North Dakota
503 – 504 = South Dakota
505 – 508 = Nebraska
509 – 515 = Kansas
516 – 517 = Montana
518 – 519 = Idaho
520 = Wyoming
521 – 524 = Colorado
525 = New Mexico
526 = Arizona
526 = New Mexico
527 = Arizona
528 – 529 = Utah
530 = Nevada
531 – 539 = Washington
540 – 544 = Oregon
545-573 = California
574 = Alaska
575-576 = Hawaii
577-579 = District of Columbia
580 = Virgin Islands
580-584 = Puerto Rico
585 = New Mexico
586 = Guam & American Samoa
586 = All Other Pacific Territories
587-588 = Mississippi
589-595 = Florida (also 261-267)
600-601 = Arizona (designated)
602-626 = California (designated)
700-728 = Railroad Retirement
729-999 = Not used until randomization was introduced.

Note: The number 666 has never been used and will not be used in the future.

Please post a comment below if you are aware of any new number ranges.

SSN Requirements

There is no law directly requiring a natural-born United States citizen to apply for a Social Security number to live or work in the United States. However, some people still live without a number because they view it as a voluntary government program. Those who don’t get a number find it difficult to engage in normal acts of commerce or banking activities because they can’t provide an SSN.

Additional Resources

If you’d like to learn more about the process, visit the Social Security Administration website. On the website, you can:

  • Get more information on how numbers are assigned and the randomization process
  • Find out where the offices are located near you and get directions using the office locator. Just enter your zip code.
  • Learn how to get cards and how to request replacement cards

Questions and Comments

If you have any questions, please post a comment below.

Does your social security number tell where you were born?

All social security numbers start with three digits, then two in the middle, and finish with four numbers. The first three numbers are called the area number. The area number shows the region or state where a person was born, and was first adopted in 1936.

What does the middle number in your Social mean?

The Group Number The middle section of numbers is simply there to make administration easier for the SSA. The group number ranges from 01 to 99 and allows Social Security Numbers with the same area number to be broken into smaller pairings. Geographic data is not indicated by the group number.

What does the group number mean in social security number?

The group number has no special geographic or data significance. It is used to break the numbers into blocks of convenient size for SSA's processing operations and for controlling the assignments to the States. The last four digits, the serial number, represent a. numerical series from 0001 to 9999 within each group.

What do the last 4 numbers in Social Security mean?

The last four digits of the SSN are the serial number. The serial number represents a straight numerical series of numbers from 0001–9999 within each group.