Social Security Number Prefixes by State
Prefix Lookup
Search historical SSN area numbers
| Prefix | State Code | State Name |
|---|---|---|
| 306 | IN | Indiana |
| 307 | IN | Indiana |
| 308 | IN | Indiana |
| 309 | IN | Indiana |
| 310 | IN | Indiana |
| 311 | IN | Indiana |
| 312 | IN | Indiana |
| 313 | IN | Indiana |
| 314 | IN | Indiana |
| 315 | IN | Indiana |
| 316 | IN | Indiana |
| 317 | IN | Indiana |
| 318 | IL | Illinois |
| 319 | IL | Illinois |
| 320 | IL | Illinois |
| 321 | IL | Illinois |
| 322 | IL | Illinois |
| 323 | IL | Illinois |
| 324 | IL | Illinois |
| 325 | IL | Illinois |