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World Trade Center Health Registry Tower Occupants on September 11, 2001, by List Source
| List | No. (%) |
| 1 source | 6295 (70.2) |
| Self-identified individuals list (SI) only | 1702 (19.0) |
| Businesses list (BL) only | 270 (3.0) |
| Port Authority list (PA) only | 4323 (48.2) |
| 2 sources | 2496 (27.8) |
| SI and BL | 88 (1.0) |
| SI and PA | 1658 (18.5) |
| BL and PA | 750 (8.4) |
| 3 sources (SI, BL, and PA) | 174 (1.9) |
| Total | 8965 (100.0) |
