What are the SSN prefixes for Washington?

Washington was assigned the area-number range 531-539. A Social Security number issued there before 2011 begins with one of these three-digit numbers.

Does an SSN starting with 531 mean the person is from Washington?

For cards issued before June 25, 2011, an SSN whose first three digits fall in Washington's range was issued in Washington, usually based on the mailing address on the application, not necessarily birthplace. Numbers issued after randomization carry no location meaning.

How can I check a specific number?

Use the SSN checker to enter a full number and see whether its structure is valid, which state it maps to, and a rough estimate of when it was issued.

Social Security Number Prefixes for Washington

Area numbers 531-539

area range: 1
lowest area number: 531
highest area number: 539
area numbers: 9

Washington was assigned the Social Security area-number range 531-539. Before SSA randomized number assignment in June 2011, any SSN beginning with one of these three-digit prefixes was issued in Washington, generally based on the mailing address on the application. Newer numbers are assigned randomly and no longer indicate a state.

Washington area-number ranges

Area-number range	Count
531-539	9

Sample Washington SSN patterns

Estimated issue years for the lowest area/group combinations (illustrative):

Pattern	Estimated issued	Status
531-01-####	1936-1950	Valid
531-03-####	1936-1950	Valid
531-05-####	1936-1950	Valid
531-07-####	1936-1950	Valid
531-09-####	1936-1950	Valid
531-10-####	1936-1950	Valid
531-12-####	1936-1950	Valid
531-14-####	1936-1950	Valid
531-16-####	1936-1950	Valid
531-18-####	1936-1950	Valid
531-20-####	1936-1950	Valid
531-22-####	1936-1950	Valid
531-24-####	1936-1950	Valid
531-26-####	1936-1950	Valid
531-28-####	1936-1950	Valid
531-30-####	1936-1950	Valid
531-32-####	1937-1951	Valid
531-34-####	1938-1952	Valid
531-36-####	1940-1952	Valid
531-38-####	1941-1953	Valid
531-40-####	1942-1954	Valid
531-42-####	1944-1955	Valid
531-44-####	1945-1956	Valid
531-46-####	1946-1957	Valid

Frequently asked questions

What are the SSN prefixes for Washington?: Washington was assigned the area-number range 531-539. A Social Security number issued there before 2011 begins with one of these three-digit numbers.
Does an SSN starting with 531 mean the person is from Washington?: For cards issued before June 25, 2011, an SSN whose first three digits fall in Washington's range was issued in Washington, usually based on the mailing address on the application, not necessarily birthplace. Numbers issued after randomization carry no location meaning.
How can I check a specific number?: Use the SSN checker to enter a full number and see whether its structure is valid, which state it maps to, and a rough estimate of when it was issued.

Check a specific number with the SSN checker, or see all states.