Social security number code by state information can still help explain older SSNs, but the rules changed in 2011. Today, the first three digits no longer identify a specific state for newly issued numbers. The Social Security Administration switched to a randomized assignment system on June 25, 2011, ending the geographic meaning that had traditionally been attached to the first three digits.
That change remains important in 2026 because many online charts still show state-by-state number ranges without making it clear that they are historical. Someone researching an older SSN may find that the first three digits point toward a particular state or region. That same approach does not work reliably for an SSN issued after the 2011 change.
The older numbering system has not disappeared from historical records. It continues to explain why certain SSNs begin with particular three-digit combinations and why those combinations were once associated with specific parts of the United States.
How the First Three Digits Were Used
An SSN has nine digits arranged in three sections:
- The first three digits were called the area number.
- The middle two digits were called the group number.
- The final four digits were called the serial number.
Under the older system, the area number had geographic significance. The system generally moved from the Northeast toward the West, giving many eastern states lower ranges and western states higher ranges.
The system was not designed to identify a person’s birthplace. It was connected to the location used when the original number was assigned.
Before 1972, local Social Security offices handled card issuance. After 1972, cards were issued through a centralized system, and the area number reflected the state associated with the ZIP code in the mailing address on the application.
That distinction is important. An older number could reflect where an application was processed or the address associated with the application rather than where the person was born.
Why State-Based Assignment Ended
The geographic assignment system worked for decades, but the federal government eventually changed the way numbers were distributed.
The major change took effect on June 25, 2011. The new method is known as SSN randomization.
Under randomization, the first three digits stopped carrying geographic meaning. The agency no longer reserves specific area-number ranges for individual states.
The change served two major purposes. It helped protect the integrity of SSNs and expanded the available pool of numbers across the country.
Randomization also made it harder to use publicly available information to predict or reconstruct an SSN.
What the Change Means in 2026
The current system is straightforward: a newly issued SSN cannot be reliably connected to a state by examining its first three digits.
That means an SSN beginning with a number historically associated with New York does not necessarily indicate New York when the number was issued after June 25, 2011.
The same applies to every other state.
Historical charts remain useful, but they should be treated as records of the previous system rather than current assignment rules.
Historical State Ranges
The old system assigned different area-number ranges to states and territories. Some states received several ranges because of population and long-term demand for numbers.
Examples from the historical system include:
| State | Historical area-number ranges |
|---|---|
| Alabama | 416–424 |
| Alaska | 574 |
| Arizona | 526–527, 600–601 |
| Arkansas | 429–432, 676–679 |
| California | 545–573, 602–626 |
| Colorado | 521–524, 650–653 |
| Connecticut | 040–049 |
| Delaware | 221–222 |
| Florida | 261–267, 589–595 |
| Georgia | 252–260, 667–675 |
| Hawaii | 575–576, 750–751 |
| Idaho | 518–519 |
| Illinois | 318–361 |
| Indiana | 303–317 |
| Iowa | 478–485 |
| Kansas | 509–515 |
| Kentucky | 400–407 |
| Louisiana | 433–439, 659–665 |
| Maine | 004–007 |
| Maryland | 212–220 |
| Massachusetts | 010–034 |
| Michigan | 362–386 |
| Minnesota | 468–477 |
| Mississippi | 425–428, 587–588 |
| Missouri | 486–500 |
| Montana | 516–517 |
| Nebraska | 505–508 |
| Nevada | 530, 680 |
| New Hampshire | 001–003 |
| New Jersey | 135–158 |
| New Mexico | 525, 585, 648–649 |
| New York | 050–134 |
| North Carolina | 232, 237–246 |
| North Dakota | 501–502 |
| Ohio | 268–302 |
| Oklahoma | 440–448 |
| Oregon | 540–544 |
| Pennsylvania | 159–211 |
| Rhode Island | 035–039 |
| South Carolina | 247–251, 654–658 |
| South Dakota | 503–504 |
| Tennessee | 408–415, 756–763 |
| Texas | 449–467, 627–645 |
| Utah | 528–529, 646–647 |
| Vermont | 008–009 |
| Virginia | 223–231, 691–699 |
| Washington | 531–539 |
| West Virginia | 232–236 |
| Wisconsin | 387–399 |
| Wyoming | 520 |
These ranges are historical. They should not be interpreted as the current system for assigning new SSNs.
Read More – Social Security Number Code by State: What the First Three Digits Used to Mean
Why New Hampshire Had the Lowest Numbers
New Hampshire was assigned the first area-number range, 001–003.
That sometimes surprises people because Maine is farther northeast geographically. However, the original numbering pattern was an administrative system rather than a perfect map of the United States.
New Hampshire’s position at the beginning of the numbering sequence became a notable part of SSN history.
Maine followed with 004–007, while Vermont received 008–009. Massachusetts then received 010–034.
From there, the historical ranges continued through other northeastern and Mid-Atlantic states before moving toward the South and West.
Why California Had Higher Numbers
California was among the states with large historical allocations. Its ranges included 545–573 and later 602–626.
The western pattern also included Oregon, Washington and other states in the region.
These high area numbers can make an older SSN appear easy to connect to a state. That interpretation is valid only when considering the historical assignment system.
It does not mean that a person with a high three-digit prefix necessarily lives in a western state today.
Does an SSN Show Where Someone Was Born?
No.
This is one of the most common misunderstandings about older SSNs.
The first three digits were connected to the geographic information used for assignment. They were not a birth-location code.
Someone born in one state could receive an older SSN connected to another state. A person could also move to another state after receiving the number.
The SSN itself normally remains unchanged after a move.
For example, someone could receive an older SSN while living in Pennsylvania and later spend decades living in Texas. Moving would not automatically result in a new SSN.
Does an SSN Change When Someone Moves?
No.
A move from one state to another does not normally require a new SSN.
This is another reason why historical state ranges should not be treated as current location information.
The number follows the individual rather than changing with every relocation.
A person who received an older geographically assigned SSN can therefore have a number associated with one state while living somewhere completely different years later.
What Happened to the Middle Two Digits?
The middle two digits were historically called the group number.
Under the former assignment system, group numbers followed an administrative sequence. They were not intended to identify a state or city.
The old sequence helped Social Security manage the distribution of numbers within each area.
Randomization changed the significance of this system. The old group-number validation method is no longer useful for numbers assigned under the newer random process.
That is why older guides discussing group-number sequences can cause confusion when applied to modern SSNs.
What Do the Last Four Digits Represent?
The final four digits were historically known as the serial number.
Under the old system, the serial number generally ran from 0001 through 9999 within each group.
These four digits were not a geographic code.
They helped distinguish individual numbers within the broader area and group structure.
The nine-digit format itself has remained unchanged. Randomization altered the way numbers are selected and assigned rather than changing the length of the SSN.
Are All Three-Digit Prefixes Available?
No.
Certain combinations are excluded from assignment.
The first three digits cannot be 000 or 666, and the 900–999 range is excluded from SSN assignment. The middle two digits cannot be 00, and the final four digits cannot be 0000.
These restrictions are separate from the old state-based system.
Randomization opened previously unused area numbers for assignment while retaining these exclusions.
That means an unfamiliar prefix should not automatically be considered invalid simply because it does not appear on an old state chart.
Why Online Charts Can Be Confusing
Search results for state-based SSN information often include charts created many years ago.
Those charts may accurately describe the historical system while still creating a misleading impression about current assignments.
The most important question is the date.
If the information concerns numbers assigned before June 25, 2011, historical area codes can be useful. If the number was assigned after that date, the first three digits do not provide a dependable state connection.
Readers should be especially careful with websites that describe every prefix as though the geographic system remains active.
It does not.
Can You Determine a Current State From the First Three Digits?
Not reliably.
A modern SSN is assigned randomly, so the first three digits no longer function as a state identifier.
The old area-number system can provide historical context for older numbers, but it cannot establish someone’s present location.
It also cannot prove where an individual currently lives, works or was born.
Why the 2011 Change Still Matters
The 2011 transition created two different periods in SSN history.
The first period covers the decades when geographic assignment played a major role. The second began on June 25, 2011, when randomization removed the geographic significance of the first three digits.
That dividing line is essential when researching an SSN.
An old number and a newly issued number may look similar because both contain nine digits. Their first three digits, however, do not carry the same meaning.
This is why a historical state chart should always be viewed alongside the date of assignment.
The Current Status of State-Based SSN Codes
As of August 16, 2026, the state-based assignment system has not returned.
New SSNs continue to follow the randomized methodology introduced in 2011.
The historical ranges remain useful for research, education and understanding how the numbering system developed. They are not a current state lookup tool.
The simplest rule is this: if an SSN was issued under the older system, its first three digits may provide historical geographic information. If it was issued under randomization, those digits should not be used to identify a state.
What Readers Should Remember
The history behind state-linked SSN prefixes is more complicated than many online charts suggest.
The first three digits once carried geographic significance, and the historical ranges can still help explain older numbers. Yet the system changed more than 15 years ago.
Since June 25, 2011, random assignment has removed the state connection from the first three digits.
That means historical information remains valuable, but it must be used in the right context. A prefix that once belonged to a particular state does not necessarily point to that state today.
For anyone researching older records, the date of assignment is therefore just as important as the first three digits.
The bottom line is simple: older SSN prefixes can reveal historical assignment patterns, but modern SSNs should never be treated as state location codes.
Frequently Asked Questions
1. Do SSN prefixes still identify states?
No. The first three digits stopped having geographic significance for newly assigned SSNs after June 25, 2011.
2. Can an older SSN prefix indicate a state?
Yes, in a historical context. Older area numbers were connected to geographic assignments, although they did not necessarily indicate a person’s birthplace or current residence.
3. Does moving to another state change an SSN?
No. Moving from one state to another does not normally result in a new SSN.
Disclaimer: This article is provided for general informational purposes and is based on publicly available information from the Social Security Administration and other referenced materials. Historical Social Security number area codes should not be used to determine a person’s current location, identity, eligibility, or legal status. Social Security number assignment rules can change, so readers should consult the Social Security Administration for official guidance regarding an individual Social Security number or current application procedures.