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SSNChecker Social Security Number verification and lookup

Is 577-40-0001 a valid SSN?

Valid

577-40-0001 looks valid in the public record. The likely issue location is District of Columbia (DC), and the year range is 1945 to 1956.

577-40-0001 matches the public SSA record

Likely issue location: District of Columbia (DC). Year range: 1945 to 1956.

Status

Valid

Matches the public SSA record.

Issue location

District of Columbia (DC)

Based on the first three digits of the SSN.

Issue years

1945 to 1956

Estimated first and last year for this number range.

Results
Status
Valid
SSN
577-40-0001
Issue location
District of Columbia (DC)
Area number
577
Group number
40
Serial number
0001
First year issued
1945
Last year issued
1956
Last published group
53
Record window
before November 2003
Date range basis
Estimated from earlier public record
Valid?
577-40-0001 is a valid SSN

What this result tells you

This number fits the published public record for old-style Social Security numbers. The first three digits point to District of Columbia (DC), and the group number falls inside the published range for that area.

The year range helps place the number roughly in time. It is useful for basic checks, research, and general context.

Area match

  • District of Columbia ยท area range 577-579

Browse the full area number directory

How the date range was worked out

This range is an estimate based on where this group falls in the public record before November 2003.

Public record window: before November 2003

Why this result came back

The checker compares the area number to the published area chart, then checks whether the group number is at or below the last published group for that area.

The serial number helps confirm the format, but it does not change the location match or the broad date range.

Check another SSN

Run another number to check the result, likely location, and year range.

Formats like `001010013` and `001-01-0013` both work.

About this result

This page checks the number against the public record, not a live Social Security Administration system.

It can help you screen a number and place it roughly in time, but it does not confirm identity or ownership.

Older numbers use wider date ranges because exact issue dates are not published for general lookup.

What was checked

1. The format rules for the area, group, and serial numbers.

2. The likely state or territory tied to the area number.

3. The public record range for that area and group.