What are the SSN prefixes for Delaware?

Delaware was assigned the area-number range 221-222. A Social Security number issued there before 2011 begins with one of these three-digit numbers.

Does an SSN starting with 221 mean the person is from Delaware?

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

Area numbers 221-222

area range: 1
lowest area number: 221
highest area number: 222
area numbers: 2

Delaware was assigned the Social Security area-number range 221-222. Before SSA randomized number assignment in June 2011, any SSN beginning with one of these three-digit prefixes was issued in Delaware, generally based on the mailing address on the application. Newer numbers are assigned randomly and no longer indicate a state.

Delaware area-number ranges

Area-number range	Count
221-222	2

Sample Delaware SSN patterns

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

Pattern	Estimated issued	Status
221-01-####	1936-1950	Valid
221-03-####	1936-1950	Valid
221-05-####	1936-1950	Valid
221-07-####	1936-1950	Valid
221-09-####	1936-1950	Valid
221-10-####	1936-1950	Valid
221-12-####	1936-1950	Valid
221-14-####	1936-1950	Valid
221-16-####	1936-1950	Valid
221-18-####	1936-1950	Valid
221-20-####	1936-1950	Valid
221-22-####	1938-1951	Valid
221-24-####	1940-1953	Valid
221-26-####	1942-1954	Valid
221-28-####	1944-1956	Valid
221-30-####	1946-1957	Valid
221-32-####	1948-1958	Valid
221-34-####	1950-1960	Valid
221-36-####	1952-1961	Valid
221-38-####	1954-1963	Valid
221-40-####	1957-1964	Valid
221-42-####	1959-1965	Valid
221-44-####	1961-1967	Valid
221-46-####	1963-1968	Valid

Frequently asked questions

What are the SSN prefixes for Delaware?: Delaware was assigned the area-number range 221-222. A Social Security number issued there before 2011 begins with one of these three-digit numbers.
Does an SSN starting with 221 mean the person is from Delaware?: For cards issued before June 25, 2011, an SSN whose first three digits fall in Delaware's range was issued in Delaware, 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.