The Feds link this number to:

Note: The database in this document is not 100 percent complete. Populous states have added numeric ranges not contained here.

Instructions:

1. Enter the first three digits of a U.S. Social Security number in question.
2. Click on the Search button.
3. See the corresponding state or territory in the field.

For the paranoid: No information you enter here is recorded or monitored--it stays entirely within your browser.