What are the SSN prefixes for Wisconsin?

Wisconsin was assigned the area-number range 387-399. A Social Security number issued there before 2011 begins with one of these three-digit numbers.

Does an SSN starting with 387 mean the person is from Wisconsin?

For cards issued before June 25, 2011, an SSN whose first three digits fall in Wisconsin's range was issued in Wisconsin, 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 Wisconsin

Area numbers 387-399

area range: 1
lowest area number: 387
highest area number: 399
area numbers: 13

Wisconsin was assigned the Social Security area-number range 387-399. Before SSA randomized number assignment in June 2011, any SSN beginning with one of these three-digit prefixes was issued in Wisconsin, generally based on the mailing address on the application. Newer numbers are assigned randomly and no longer indicate a state.

Wisconsin area-number ranges

Area-number range	Count
387-399	13

Sample Wisconsin SSN patterns

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

Pattern	Estimated issued	Status
387-01-####	1936-1950	Valid
387-03-####	1936-1950	Valid
387-05-####	1936-1950	Valid
387-07-####	1936-1950	Valid
387-09-####	1936-1950	Valid
387-10-####	1936-1950	Valid
387-12-####	1936-1950	Valid
387-14-####	1936-1950	Valid
387-16-####	1936-1950	Valid
387-18-####	1936-1950	Valid
387-20-####	1936-1950	Valid
387-22-####	1936-1950	Valid
387-24-####	1936-1950	Valid
387-26-####	1937-1951	Valid
387-28-####	1939-1952	Valid
387-30-####	1940-1953	Valid
387-32-####	1942-1954	Valid
387-34-####	1943-1955	Valid
387-36-####	1945-1956	Valid
387-38-####	1947-1957	Valid
387-40-####	1948-1958	Valid
387-42-####	1950-1960	Valid
387-44-####	1952-1961	Valid
387-46-####	1953-1962	Valid

Frequently asked questions

What are the SSN prefixes for Wisconsin?: Wisconsin was assigned the area-number range 387-399. A Social Security number issued there before 2011 begins with one of these three-digit numbers.
Does an SSN starting with 387 mean the person is from Wisconsin?: For cards issued before June 25, 2011, an SSN whose first three digits fall in Wisconsin's range was issued in Wisconsin, 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.