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NIH.gov Worldwide usage compared with other US government top-level domains, April 2005, based on comScore data
| Web Domain | Unique Visitors(millions) | Total PagesDownloaded(millions) |
| NIH.gov | 16.8 | 287.3 |
| Army.mil | 4.2 | 162.6 |
| Navy.mil | 3.0 | 43.1 |
| CIA.gov | 2.9 | 12.2 |
| AF.mil (Air Force) | 2.0 | 47.2 |
| WhiteHouse.gov | 2.3 | 24.8 |
| House.gov | 1.5 | 7.5 |
| Senate.gov | .978 | 6.2 |
